Ford F-650 / 750 (2023 year). Manual in english — page 15

E317619

10.

Reconnect the mass air flow sensor
electrical connector to the outlet
tube. Make sure the locking tab on
the connector is in the locked
position.

DRAINING THE FUEL FILTER
WATER TRAP - 6.7L DIESEL

Your vehicle is equipped with a diesel fuel
conditioner module located on the
frame-rail under the driver-side floorboard
near the transmission.

You should drain water from the
module assembly whenever the
warning light comes on and the

message center directs you to drain the
water separator. This will occur when
approximately 8.45 fl oz (250 ml) of water
accumulates in the module. If you allow
the water level to exceed this level, the
water may pass through to the engine and
may cause fuel injection equipment
damage.

Draining the Diesel Fuel
Conditioner Module (DFCM)

WARNING:

Do not drain the

water-in-fuel separator while the engine
is running. Failure to follow this warning
may result in fire, serious injury, death or
property damage.

Note:

If you drain the diesel fuel conditioner

module while the system is running air will
enter into the fuel system. The engine will
not operate properly if air enters the system.

Note:

With fuel tank levels above 3⁄4 tank

it may be necessary to loosen the bowl three
turns before opening the drain. This will
actuate an anti-siphon valve at the fuel and
water separator inlet and prevent the fuel
from siphoning out of the tank.

Note:

A loose drain valve can allow air to

enter the fuel system and cause drivetrain
issues. The engine will not operate properly.
Be sure that you fully tighten the drain valve.

Stop your vehicle and shut off the
engine.

2. Locate the diesel fuel conditioner

module and place an appropriate
container under the drain port.

E163360

232

Maintenance

3. Rotate the drain counterclockwise until

the O-ring is visible. Allow the diesel
fuel conditioner module to drain for
approximately 25 seconds or until
clean fuel is observed. Rotate the drain
clockwise to tighten it. If no liquid
drains, there may be a clog in the drain.
Have the conditioner module serviced
by an authorized dealer.

4. Make sure that you fully tighten the

drain valve and then remove the
container from under your vehicle.

5. Restart the engine. If the

Water in Fuel

Drain Filter

message and light

continues to illuminate, have the fuel
system checked and repaired.

ENGINE COOLANT CHECK -
6.7L DIESEL

WARNING:

Do not remove the

coolant reservoir cap when the cooling
system is hot. Wait 10 minutes for the
cooling system to cool down. Cover the
coolant reservoir cap with a thick cloth
to prevent the possibility of scalding and
slowly remove the cap. Failure to follow
this instruction could result in personal
injury.

WARNING:

Do not put coolant in

the windshield washer reservoir. If
sprayed on the windshield, coolant could
make it difficult to see through the
windshield.

WARNING:

To reduce the risk of

personal injury, make sure the engine is
cool before unscrewing the coolant
pressure relief cap. The cooling system
is under pressure. Steam and hot liquid
can come out forcefully when you loosen
the cap slightly.

WARNING:

Do not add coolant

further than the

MAX

mark.

When the engine is cold, check the
concentration and level of the coolant at
the intervals listed in the scheduled
maintenance information. See

Scheduled

Maintenance

(page 319).

Note:

Make sure that the coolant level is

between the

MIN

and

MAX

marks on the

coolant reservoir.

Note:

Coolant expands when it is hot. The

level may extend beyond the

MAX

mark.

Maintain coolant concentration within
48% to 50%, which equates to a freeze
point between -30°F (-34°C) and -34°F
(-37°C). Coolant concentration should be
checked using a refractometer. We do not
recommend the use of hydrometers or
coolant test strips for measuring coolant
concentration.

Adding Coolant

WARNING:

Do not add engine

coolant when the engine is hot. Failure
to follow this instruction could result in
personal injury.

WARNING:

Do not remove the

Note:

Automotive fluids are not

interchangeable. Do not use coolant or
windshield washer fluid outside of its
specified function and vehicle location.

233

Maintenance

Note:

Do not use stop leak pellets, cooling

system sealants, or non-specified additives
as they can cause damage to the engine
cooling or heating systems. Resulting
component damage may not be covered by
the vehicle Warranty.

It is very important to use prediluted
coolant approved to the correct
specification in order to avoid plugging the
small passageways in the engine cooling
system. See

Cooling System Capacity

and Specification

(page 297). Do not mix

different colors or types of coolant in your
vehicle. Mixing of engine coolants or using
an incorrect coolant may harm the engine
or cooling system components and may
not be covered by the vehicle Warranty.

Note:

Coolants marketed for all makes and

models may not be approved to Ford
specifications and may cause damage to
the cooling system. Resulting component
damage may not be covered by the vehicle
Warranty.

If the coolant level is at or below the
minimum mark, add prediluted coolant
immediately.

For vehicles with overflow coolant systems
with a non-pressurized cap on the coolant
recovery system, add coolant to the
coolant recovery reservoir when the engine
is cool. Add prediluted coolant to the
maximum level. For all vehicles which have
a coolant degas system with a pressurized
cap, or if it is necessary to remove the
coolant pressure relief cap on the radiator,
follow these steps to add engine coolant:

Turn the engine off and let it cool.

2. Unscrew the cap slowly. Any pressure

escapes as you unscrew the cap.

3. Fill the coolant reservoir slowly with

prediluted engine coolant to within the
minimum and maximum range on the
engine coolant reservoir. If you
removed the radiator cap in an
overflow system, fill the radiator until

the coolant is visible and the radiator
is almost full. If coolant is added to
bring the level within the minimum and
maximum range when the engine is not
cold, the system may remain under
filled.

4. Replace the coolant reservoir cap, turn

it clockwise until you feel a strong
resistance.

5. Check the coolant level in the coolant

reservoir the next few times you drive
your vehicle. If necessary, add enough
prediluted engine coolant to bring the
coolant level to the proper level.

Note:

If prediluted coolant is not available,

use the approved antifreeze concentrate
diluting it to 50/50 with distilled water. See

Cooling System Capacity and
Specification

(page 297). Using water that

has not been deionized may contribute to
deposit formation, corrosion or plugging of
the small cooling system passageways.

If you have to add more than 1.1 qt (1 L) of
engine coolant per month, have your
vehicle checked as soon as possible.
Operating an engine with a low level of
coolant can result in engine overheating
and possible engine damage.

Note:

During normal vehicle operation, the

coolant may change color from orange to
pink or light red. As long as the coolant is
clear and uncontaminated, this color change
does not indicate the coolant has degraded
nor does it require the coolant to be drained,
the system to be flushed, or the coolant to
be replaced.

In case of emergency, you can add a large
amount of water without prediluted
coolant in order to reach a vehicle service
location. On arrival do the following:

Drain the cooling system.

2. Chemically clean the cooling system.

We recommend Motorcraft Premium
Cooling System Flush.

234

Maintenance

3. Refill with prediluted coolant as soon

as possible.

Water alone, without prediluted coolant,
can cause engine damage from corrosion,
overheating or freezing.

Do not use the following as a coolant
substitute:

•

Alcohol.

•

Methanol.

•

Brine.

•

Any coolant mixed with alcohol or
methanol antifreeze.

Alcohol and other liquids can cause engine
damage from overheating or freezing.

Do not add extra inhibitors or non-specified
additives to the coolant. These can be
harmful and compromise the corrosion
protection of the coolant.

Engine and Secondary Cooling
System Refill Procedure

The following procedure should be used
when refilling the engine or secondary
cooling systems after it has been drained
or become extremely low:

Before you remove the cap, turn the
engine off and let it cool.

2. When the engine is cool, wrap a thick

cloth around the cap. Slowly turn cap
counterclockwise until pressure begins
to release.

3. Step back when the pressure releases.

4. When you are sure that all the pressure

has been released, use the cloth to turn
the cap counterclockwise and then
remove it.

5. Slowly add prediluted engine coolant

to the coolant reservoir until the
coolant level is within the minimum
and maximum range as listed on the
reservoir.

6. Reinstall the pressure relief cap.

Start and run the engine at 2000 rpm
for 2 minutes.

8. Shut engine off, and remove the

pressure relief cap as previously
outlined.

9. If required, add prediluted engine

coolant to the coolant reservoir until
the coolant level is within the minimum
and maximum range as listed on the
reservoir.

10.

Engine cooling system: Repeat steps
5 through 9 until the coolant level has
stabilized (is no longer dropping after
each step) and the upper radiator
hose at the radiator is warm to the
touch (indicating that the engine
thermostat is open and coolant is
flowing through the radiator).

11.

Check the secondary cooling system.
Repeat steps 1 through 10 until the
coolant level has stabilized (is no
longer dropping after each step) and
the lower passenger side of the
secondary radiator is warm to the
touch (indicating secondary
thermostat is open and coolant is
flowing through the entire system).

12.

Check the coolant level in both
systems before you drive your vehicle
the next few times.

13.

If necessary, add prediluted engine
coolant to the coolant reservoirs until
the coolant level is within the
minimum and maximum range as
listed on the reservoir. After any
coolant has been added, check the
coolant concentration.

Recycled Coolant

We do not recommend the use of recycled
coolant as an approved recycling process
is not yet available.

235

Maintenance

Dispose of used engine coolant in an
appropriate manner. Follow your
community’s regulations and standards
for recycling and disposing of automotive
fluids.

Severe Climates

If you drive in extremely cold climates:

•

It may be necessary to increase the
coolant concentration above 50%.

•

A coolant concentration of 60%
provides improved freeze point
protection. Coolant concentrations
above 60% decrease the overheat
protection characteristics of the
coolant and may cause engine
damage.

If you drive in extremely hot climates:

•

You can decrease the coolant
concentration to 40%.

•

Coolant concentrations below 40%
decrease the freeze and corrosion
protection characteristics of the
coolant and may cause engine
damage.

Vehicles driven year-round in non-extreme
climates should use prediluted engine
coolant for optimum cooling system and
engine protection.

Checking Coolant Corrosion
Inhibitor Additive Strength

At specific mileage intervals as listed in the
scheduled maintenance information
chapter, the coolant corrosion inhibitor
additive should be checked. An information
message may display in the optional
information display at this time. The
purpose of checking is to verify the correct
engine coolant concentration (freeze point
protection) and corrosion inhibitor additive
level (strength) of the coolant for
maximum engine performance and
protection.

Three products are available to confirm
the life and health of the coolant, one tool,
a test kit and a coolant inhibitor additive:

236

Maintenance

•

Robinair® Coolant and Battery
Refractometer 75240

–

Recommended refractometer to test
coolant concentration. (Rotunda tool
part number: ROB75240).

•

Rotunda 328-R071–ELC (Antifreeze
Coolant ELC Contamination Kit)

–

Evaluates the corrosion inhibitor
additive strength.

•

The first step is once the coolant
concentration is verified to be in the
range of 40 – 60%. Test the
corrosion inhibitor additive
strength. If the test results show
the cooling system does not have
excessive contamination and the
corrosion inhibitor additive strength
is sufficient then no further action
is required. If the test results for the
Engine Coolant Circuit show the
cooling system has excessive
contamination or the corrosion
inhibitor additive strength is not
sufficient then add 47 fl oz (1.4 L)
of Motorcraft Specialty Orange
Engine Coolant Revitalizer. If the
test results for the Secondary
Coolant Circuit show the cooling
system has excessive
contamination or the corrosion
inhibitor additive strength is not
sufficient then add 16 fl oz (0.47 L)
of Motorcraft Specialty Orange
Engine Coolant Revitalizer.

•

Motorcraft Specialty Orange Engine
Coolant Revitalizer

– Additive to

boost the corrosion inhibitor level
based upon the test results of the
Antifreeze Coolant ELC Contamination
Kit. The Revitalizer may be added two
times over the life of the coolant. If
additional dosages are required, the
cooling system must be flushed and
refilled per the instructions in the
Workshop Manual.

Make sure to follow the proper coolant and
additive specifications. See

Capacities

and Specifications

(page 288).

Coolant Change

At specific mileage intervals, as listed in
the scheduled maintenance information,
the coolant should be changed. The
information display may display a message
to change coolant at this time. Add
prediluted coolant approved to the correct
specification. See

Capacities and

Specifications

(page 288).

Engine-driven Cooling Fan (Fan
Clutch)

Your vehicle may have an engine driven
cooling fan drive (also called a fan clutch).
This fan drive changes the fan speed to
match the vehicle’s changing cooling air
flow requirements. Fan speed, fan noise
level and fuel consumption all will increase
based on the driving conditions that
include trailer towing, hill climbing, heavy
loads, high speed and high ambient
temperature, individually or in combination.

The fan drive is designed to provide the
minimum fan speed (and resulting
minimum fan noise and fuel consumption)
required to meet the ever changing vehicle
cooling air flow requirements. You will hear
the amount of fan noise increasing and
decreasing as the engine power
requirements and vehicle driving conditions
change as you drive. This is to be expected
as being normal to the operation of your
vehicle. High levels of fan noise might also
be heard when your engine is first started,
and should normally decrease after driving
for a short time.

237

Maintenance

ENGINE COOLANT CHECK -
7.3L

WARNING:

Do not remove the

coolant reservoir cap when the engine is
on or the cooling system is hot. Wait 10
minutes for the cooling system to cool
down. Cover the coolant reservoir cap
with a thick cloth to prevent the
possibility of scalding and slowly remove
the cap. Failure to follow this instruction
could result in personal injury.

WARNING:

Do not put coolant in

the windshield washer reservoir. If
sprayed on the windshield, coolant could
make it difficult to see through the
windshield.

WARNING:

To reduce the risk of

WARNING:

Do not add coolant

further than the

MAX

mark.

When the engine is cold, check the
concentration and level of the coolant at
the intervals listed in the scheduled
maintenance information. See

Scheduled

Maintenance

(page 319).

Note:

Make sure that the coolant level is

between the

MIN

and

MAX

marks on the

coolant reservoir.

Note:

Coolant expands when it is hot. The

level may extend beyond the

MAX

mark.

Maintain coolant concentration within
48% to 50%, which equates to a freeze
point between -30°F (-34°C) and -34°F
(-37°C). Check the coolant concentration
using a refractometer. We do not
recommend the use of hydrometers or
coolant test strips for measuring coolant
concentration.

Adding Coolant

WARNING:

Do not add engine

coolant when the engine is on or the
cooling system is hot. Failure to follow
this instruction could result in personal
injury.

WARNING:

Do not remove the

Note:

Automotive fluids are not

interchangeable. Do not use coolant or
windshield washer fluid outside of its
specified function and vehicle location.

Note:

Do not use stop leak pellets, cooling

system sealants, or non-specified additives
as they can cause damage to the engine
cooling or heating systems. Resulting
component damage may not be covered by
the vehicle Warranty.

238

Maintenance

It is very important to use prediluted
coolant approved to the correct
specification in order to avoid plugging the
small passageways in the engine cooling
system. See

Cooling System Capacity

and Specification

(page 298). Do not mix

Note:

Coolants marketed for all makes and

models may not be approved to our
specifications and may cause damage to
the cooling system. Resulting component
damage may not be covered by the vehicle
Warranty.

If the coolant level is at or below the
minimum mark, add prediluted coolant
immediately.

Turn the engine off and let it cool.

2. Unscrew the cap slowly. Any pressure

escapes as you unscrew the cap.

3. Fill the coolant reservoir slowly with

prediluted engine coolant to within the
minimum and maximum range on the
engine coolant reservoir. If you
removed the radiator cap in an
overflow system, fill the radiator until
the coolant is visible and the radiator
is almost full. If coolant is added to
bring the level within the minimum and
maximum range when the engine is not
cold, the system may remain
underfilled.

4. Replace the coolant reservoir cap. Turn

the cap clockwise until it contacts the
hard stop.

5. Check the coolant level in the coolant

reservoir the next few times you drive
your vehicle. If necessary, add enough
prediluted engine coolant to bring the
coolant level to the proper level.

Note:

If prediluted coolant is not available,

use the approved antifreeze concentrate
diluting it to 50/50 with distilled water. See

Cooling System Capacity and
Specification

(page 298). Using water that

has not been deionized may contribute to
deposit formation, corrosion or plugging of
the small cooling system passageways.

Note:

During normal vehicle operation, the

Note:

In case of emergency, you can add a

large amount of water without coolant in
order to reach a vehicle service location.
Water alone, without coolant, can cause
engine damage from corrosion, overheating
or freezing. When you reach a service
location, you must have the cooling system
drained, flushed and refilled using the
correct specification prediluted coolant or
antifreeze concentrate. See

Cooling

System Capacity and Specification

(page

298).

239

Maintenance

Do not use the following as a coolant
substitute:

•

Alcohol.

•

Methanol.

•

Brine.

•

Any coolant mixed with alcohol or
methanol antifreeze.

Alcohol and other liquids can cause engine
damage from overheating or freezing.

Do not add extra inhibitors or additives to
the coolant. These can be harmful and
compromise the corrosion protection of
the coolant.

Recycled Coolant

We do not recommend the use of recycled
coolant as an approved recycling process
is not yet available.

Dispose of used engine coolant in an
appropriate manner. Follow your
community’s regulations and standards
for recycling and disposing of automotive
fluids.

Severe Climates

If you drive in extremely cold climates:

•

It may be necessary to increase the
coolant concentration above 50%.

•

A coolant concentration of 60%
provides improved freeze point
protection. Coolant concentrations
above 60% decrease the overheat
protection characteristics of the
coolant and may cause engine
damage.

If you drive in extremely hot climates:

•

You can decrease the coolant
concentration to 40%.

•

Coolant concentrations below 40%
decrease the freeze and corrosion
protection characteristics of the
coolant and may cause engine
damage.

Vehicles driven year-round in non-extreme
climates should use prediluted engine
coolant for optimum cooling system and
engine protection.

Coolant Change

Change the coolant at specific mileage
intervals as listed in the scheduled
maintenance information. The information
display may display a message to change
coolant at this time. Add prediluted
coolant approved to the correct
specification. See

Capacities and

Specifications

(page 288).

Engine-driven Cooling Fan (Fan
Clutch)

Your vehicle comes with an engine driven
cooling fan drive, also called a fan clutch.
This fan drive changes the fan speed to
match the vehicle’s changing cooling air
flow requirements. Fan speed, fan noise
level and fuel consumption all will increase
based on the driving conditions that
include trailer towing, hill climbing, heavy
loads, high speed and high ambient
temperature, individually or in combination.

The fan drive is designed to provide the
minimum fan speed, and resulting
minimum fan noise and fuel consumption
required to meet the ever changing vehicle
cooling air flow requirements. You will hear
the amount of fan noise increasing and
decreasing as the engine power
requirements and vehicle driving conditions

240

Maintenance

change as you drive. This is to be expected
as being normal to the operation of your
vehicle. High levels of fan noise might also
be heard when your engine is first started,
and should normally decrease after driving
for a short time.

Fail-Safe Cooling

Fail-safe cooling allows you to temporarily
drive your vehicle before any incremental
component damage occurs. The fail-safe
distance depends on ambient
temperature, vehicle load and terrain.

How Fail-Safe Cooling Works

If the engine begins to overheat, the
coolant temperature gauge moves toward
the red zone:

A warning lamp illuminates and
a message may appear in the
information display.

If the engine reaches a preset
over-temperature condition, the engine
switches to alternating cylinder operation.
Each disabled cylinder acts as an air pump
and cools the engine.

When this occurs, your vehicle still
operates, however:

•

Engine power is limited.

•

The air conditioning system turns off.

Continued operation increases the engine
temperature, causing the engine to
completely shut down. Your steering and
braking effort increases in this situation.

When the engine temperature cools, you
can re-start the engine. Have your vehicle
checked as soon as possible to minimize
engine damage.

When Fail-Safe Mode Is Activated

WARNING:

Fail-safe mode is for

use during emergencies only. Operate
your vehicle in fail-safe mode only as
long as necessary to bring your vehicle
to rest in a safe location and seek
immediate repairs. When in fail-safe
mode, your vehicle will have limited
power, will not be able to maintain
high-speed operation, and may
completely shut down without warning,
potentially losing engine power, power
steering assist, and power brake assist,
which may increase the possibility of a
crash resulting in serious injury.

WARNING:

Do not remove the

Your vehicle has limited engine power
when in the fail-safe mode, drive your
vehicle with caution. Your vehicle does not
maintain high-speed operation and the
engine may operate poorly.

Remember that the engine is capable of
shutting down to prevent engine damage.
In this situation:

Pull off the road as soon as safely
possible and switch the engine off.

2. If you are a member of a roadside

assistance program, we recommend
that you contact your roadside
assistance service provider.

3. If this is not possible, wait a short

period for the engine to cool.

241

Maintenance

4. Check the coolant level. If the coolant

level is at or below the minimum mark,
add prediluted coolant immediately.

5. When the engine temperature cools,

you can re-start the engine. Have your
vehicle checked as soon as possible to
minimize engine damage.

Note:

Driving your vehicle without repair

increases the chance of engine damage.

Engine Coolant Temperature
Management

(If Equipped)

WARNING:

To reduce the risk of

crash and injury, be prepared that the
vehicle speed may reduce and the
vehicle may not be able to accelerate
with full power until the coolant
temperature reduces.

If you tow a trailer with your vehicle, the
engine may temporarily reach a higher
temperature during severe operating
conditions, for example ascending a long
or steep grade in high ambient
temperatures.

At this time, you may notice the coolant
temperature gauge moves toward the red
zone and a message may appear in the
information display.

You may notice a reduction in vehicle
speed caused by reduced engine power in
order to manage the engine coolant
temperature. Your vehicle may enter this
mode if certain high-temperature and
high-load conditions take place. The
amount of speed reduction depends on
vehicle loading, grade and ambient
temperature. If this occurs, there is no
need to pull off the road. You can continue
to drive your vehicle.

The air conditioning may turn on and off
during severe operating conditions to
protect the engine from overheating. When
the coolant temperature decreases to the
normal operating temperature, the air
conditioning turns on.

If the coolant temperature gauge moves
fully into the red zone, or if the coolant
temperature warning or service engine
soon messages appear in your information
display, do the following:

Pull off the road as soon as safely
possible and shift the transmission into
park (P).

2. Leave the engine running until the

coolant temperature gauge needle
returns to the normal position. After
several minutes, if the temperature
does not drop, follow the remaining
steps.

3. Switch the engine off and wait for it to

cool. Check the coolant level.

4. If the coolant level is at or below the

minimum mark, add prediluted coolant
immediately.

5. If the coolant level is normal, restart

the engine and continue.

AUTOMATIC TRANSMISSION
FLUID CHECK

The transmission does not consume fluid.
However, check the fluid level if the
transmission is not working properly, for
example if the transmission slips, shifts
slowly or if there are signs of fluid loss.

Replace the transmission fluid and filter
on your vehicle at the specified service
interval. See

Scheduled Maintenance

(page 319).

Automatic transmission fluid expands
when warmed. To check the fluid level
consistently and accurately, do the
following:

242

Maintenance

Drive the vehicle until it reaches normal
operating temperature. This may take
up to 20 mi (30 km). Make sure that
the transmission fluid temperature
gauge on the instrument cluster is
within normal operating temperature
196–215°F (91–102°C) before
checking.

2. Make sure that your vehicle is on level

ground.

3. With the engine running, parking brake

engaged and your foot on the brake
pedal, move the gearshift lever through
all of the gear ranges. Allow sufficient
time for each gear to engage.

4. Make sure the parking brake is on. Make

sure the transmission is in park (P) or
neutral (N) and leave the engine
running.

5. Open the hood. See

Opening and

Closing the Hood

(page 220).

6. Remove the dipstick and wipe it with

a clean, lint-free cloth. See

Under

Hood Overview

(page 222).

Replace the dipstick and remove it
again to check the fluid level.

8. If the fluid level is correct, replace the

dipstick and make sure it is fully seated.

Note:

If the fluid level is between the

maximum and minimum marks, the fluid
level is acceptable. Do not add fluid.

Transmission Fluid Level

Low Fluid Level

E163740

If the fluid level is at or below the minimum
mark, add fluid immediately. See

Automatic Transmission Fluid
Capacity and Specification

(page 302).

Note:

If there is no indication of fluid on the

dipstick, have your vehicle checked
immediately.

Correct Fluid Level

E163742

Make sure that the fluid level is between
the maximum and minimum marks.

243

Maintenance

High Fluid Level

E163744

Do not add fluid further than the maximum
mark. Fluid levels above the maximum
mark could cause shift or engagement
concerns and possible damage.

Note:

An overheating condition can cause

high fluid levels.

Adding Transmission Fluid

Do not use supplemental transmission
fluid additives, treatments or cleaning
agents. The use of these materials could
affect transmission operation and result
in damage to internal transmission
components and could lead to
transmission damage that the vehicle
Warranty does not cover.

Use only recommended transmission fluid
that meets our specifications. See

Automatic Transmission Fluid
Capacity and Specification

(page 302).

Note:

Use of a non-approved automatic

transmission fluid could cause internal
transmission component damage.

If necessary, add fluid in 8 fl oz (250 ml)
increments through the filler tube until the
level is correct.

If an overfill occurs, remove excess fluid
and have your vehicle checked as soon as
possible.

BRAKE FLUID CHECK

WARNING:

Do not use any fluid

other than the recommended brake fluid
as this will reduce brake efficiency. Use
of incorrect fluid could result in the loss
of vehicle control, serious personal injury
or death.

WARNING:

Only use brake fluid

from a sealed container. Contamination
with dirt, water, petroleum products or
other materials may result in brake
system damage or failure. Failure to
adhere to this warning could result in the
loss of vehicle control, serious personal
injury or death.

WARNING:

Do not allow the fluid

to touch your skin or eyes. If this
happens, rinse the affected areas
immediately with plenty of water and
contact your physician.

WARNING:

The brake system

could be affected if the brake fluid level
is below the

MIN

mark or above the

MAX

mark on the brake fluid reservoir.

244

Maintenance

E170684

Park your vehicle on a level surface.

2. Look at the brake fluid reservoir to see

where the brake fluid level is relative
to the

MIN

and the

MAX

marks on the

reservoir.

Note:

If the brake fluid level is between the

MIN

and the

MAX

marks on the reservoir, it

is acceptable.

Note:

If the brake fluid level is below the

MIN

mark or above the

MAX

mark, have

your vehicle checked as soon as possible.

Note:

To avoid fluid contamination, the

reservoir cap must remain in place and fully
tight, unless you are adding fluid.

Only use fluid that meets our
specifications. See

Capacities and

Specifications

(page 288).

Brake Fluid Service Interval

Brake fluid absorbs water over time which
degrades the effectiveness of the brake
fluid. Change the brake fluid at the
specified intervals to prevent degraded
braking performance.

For detailed interval information, see
Scheduled Maintenance in your Owner's
Manual or your local maintenance guide.

POWER STEERING FLUID
CHECK

Check the power steering fluid. See

Scheduled Maintenance

(page 319). If

adding fluid is necessary, use only
MERCON LV ATF

Check the fluid level when it is at ambient
temperature.

Check the fluid level in the reservoir. It
should be between the MIN and MAX
range. Do not add fluid if the level is
within this range.

2. If the fluid level is low, add fluid to bring

the fluid level up to between the MIN
and MAX range.

3. Switch the engine on.

4. While the engine idles, turn the steering

wheel left and right several times.

5. Switch the engine off.

6. Recheck the fluid level in the reservoir.

Do not add fluid if the level is between
the MIN and MAX range.

If the fluid is low, add the proper type
of fluid in small amounts, continuously
checking the level until it is between
the MIN and MAX range. See

Hydraulic Power Steering Fluid
Capacity and Specification

(page

306). Be sure to put the cap back on the
reservoir.

245

Maintenance

CHANGING THE 12V BATTERY

WARNING:

This vehicle may be

equipped with more than one battery,
removal of cable from only one battery
does not disconnect the vehicle
electrical system. Be sure to disconnect
cables from all batteries when
disconnecting power. Failure to do so
may cause serious personal injury or
property damage.

WARNING:

Batteries normally

produce explosive gases which can
cause personal injury. Therefore, do not
allow flames, sparks or lighted
substances to come near the battery.
When working near the battery, always
shield your face and protect your eyes.
Always provide proper ventilation.

WARNING:

When lifting a

plastic-cased battery, excessive pressure
on the end walls could cause acid to flow
through the vent caps, resulting in
personal injury and damage to the
vehicle or battery. Lift the battery with a
battery carrier or with your hands on
opposite corners.

WARNING:

Keep batteries out of

reach of children. Batteries contain
sulfuric acid. Avoid contact with skin,
eyes or clothing. Shield your eyes when
working near the battery to protect
against possible splashing of acid
solution. In case of acid contact with skin
or eyes, flush immediately with water for
a minimum of 15 minutes and get prompt
medical attention. If acid is swallowed,
call a physician immediately.

Note:

If your battery has a cover/shield,

make sure it is reinstalled after the battery
has been cleaned or replaced.

Note:

Battery posts, terminals and related

accessories contain lead and lead
compounds. Wash hands after handling.

Note:

Electrical or electronic accessories

or components added to the vehicle by the
dealer or the owner may adversely affect
battery performance and durability.

Your vehicle is equipped with a Motorcraft
maintenance-free battery which normally
does not require additional water during
its life of service.

For longer, trouble-free operation, keep the
top of the battery clean and dry. Also,
make certain the battery cables are always
tightly fastened to the battery terminals.

If you see any corrosion on the battery or
terminals, remove the cables from the
terminals and clean with a wire brush. You
can neutralize the acid with a solution of
baking soda and water.

It is recommended that the negative
battery cable terminal be disconnected
from the battery if you plan to store your
vehicle for an extended period of time.

Because your vehicle’s engine is
electronically controlled by a computer,
some control conditions are maintained
by power from the battery. When the
battery is disconnected or a new battery
is installed, the engine must relearn its idle
and fuel trim strategy for optimum
driveability and performance. To begin this
process

With the vehicle at a complete stop,
set the parking brake.

2. Put the gearshift in park (P) or neutral

(N) and turn off all accessories.

3. Start the engine. Run the engine until

it reaches normal operating
temperature.

4. Allow the engine to idle for at least one

minute.

246

Maintenance

5. Turn the air conditioning (if equipped)

on and allow the engine to idle for at
least one minute.

6. Release the parking brake. With your

foot on the brake pedal and with the
air conditioning on, put the vehicle in
drive (D) and allow the engine to idle
for at least one minute.

•

If you do not allow the engine to
relearn its idle trim, the idle quality
of your vehicle may be adversely
affected until the idle trim is
eventually relearned.

Drive the vehicle to complete the
relearning process

•

The vehicle may need to be driven
10 mi (16 km) or more to relearn the
idle and fuel trim strategy along
with the ethanol content for flexible
fuel vehicles.

If the battery has been disconnected or a
new battery has been installed, the clock
and radio settings must be reset once the
battery is reconnected.

Always dispose of automotive
batteries in a responsible manner.
Follow your local authorized standards
for disposal. Call your local authorized
recycling center to find out more about
recycling automotive batteries.

Battery Management System (If
Equipped)

The battery management system (BMS)
monitors battery conditions and takes
actions to extend battery life. If excessive
battery drain is detected, the system may
temporarily disable certain electrical
features to protect the battery. Those
electrical accessories affected include the
rear defrost, heated/cooled seats, climate
control fan, heated steering wheel, audio
and navigation system. A message may be
shown in the information displays to alert

the driver that battery protection actions
are active. These messages are only for
notification that an action is taking place,
and not intended to indicate an electrical
problem or that the battery requires
replacement.

Electrical accessory installation

To ensure proper operation of the BMS,
any electrical devices that are added to
the vehicle should not have their ground
connection made directly at the negative
battery post. A connection at the negative
battery post can cause inaccurate
measurements of the battery condition
and potential incorrect system operation.

Note:

Electrical or electronic accessories

added to the vehicle by the dealer or the
owner may adversely affect battery
performance and durability, and may also
affect the performance of other electrical
systems in the vehicle.

When a battery replacement is required,
the battery should only be replaced with
a Ford recommended replacement battery
which matches the electrical requirements
of the vehicle. After battery replacement,
or in some cases after charging the battery
with the external charger, the BMS requires
eight hours of vehicle sleep time (key off
with doors closed) to relearn the new
battery state of charge. Prior to relearning
the state of charge, the BMS may disable
electrical features (to protect the battery)
earlier than normal.

ADJUSTING THE HEADLAMPS

Vertical Aim Adjustment

The headlamps on your vehicle are
properly aimed at the assembly plant. If
your vehicle has been in an accident, the
alignment of your headlamps should be
checked by your authorized dealer.

247

Maintenance

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Ford F-650 / 750 (2023 year). Manual in english — page 15

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