Freightliner Century Class. Manual — part 36

f720613

8/24/2005

A

B

A. Hinge installed on or after 8/1/2005, with dimple in the top loop of the hinge bracket. Do not lubricate.
B. Hinge installed before 8/1/2005. Lubricate according to recommendations.

Fig. 1, Door Hinge Identification

Door

72

72/2

MOP Number

Air Conditioner Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–01

Air Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–02

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–00

Heater and Air Conditioner

83

Index, Alphabetical

83–00 Safety Precautions

Safety Precautions in this section apply to all
procedures within this group.

DANGER

When working on the vehicle, shut down the en-
gine, set the parking brake, and chock the tires.
Before working under the vehicle, always place
jack stands under the frame rails to ensure the
vehicle can not drop. Failure to follow these steps
could result in serious personal injury or death.

83–01 Air Conditioner

Inspection

WARNING

Wear eye protection, gloves, and protective cloth-
ing when working on the air conditioning system.
Leaking refrigerant from a damaged hose or line
could cause blindness or serious skin burns.

Preliminary Checks

1.

Park the vehicle on a level surface, apply the
parking brakes, and chock the tires.

2.

Check the appearance of the refrigerant com-
pressor pulley assembly. If the friction surface of
the pulley shows signs of excessive grooving
due to belt slippage, replace both the pulley and
the drive plate. Inspect the refrigerant compres-
sor drive belt for damage, and check that the belt
is set at the proper tension. Also check the tight-
ness of the compressor mounting fasteners. For
instructions and torque values, see Group 01 of
the Century Class Trucks Workshop Manual.

3.

Inspect the drive plate. If the friction surface of
the drive plate shows visible signs of damage
due to excessive heat, replace the drive plate
and pulley assembly. For instructions, see Group
83 of the Century Class Trucks Workshop
Manual.

4.

On a Sanden refrigerant compressor, use a
feeler gauge to check that the drive plate clutch
clearance is 0.016 to 0.031 inch (0.40 to 0.78
mm). See

Fig. 1

. If the drive plate clutch requires

adjustment, see Section 83.01, Subject 140 of
the Century Class Trucks Workshop Manual.

On a Climate Control refrigerant compressor,
place a feeler gauge between the air conditioner
compressor clutch and the pulley to check the
compressor clutch clearance. Drive plate to pul-
ley clearance should be 0.020 to 0.030 inch
(0.50 to 0.76 mm). If the clearance is 0.035 inch
(0.89 mm) or greater, replace the clutch. For in-
structions, see Section 83.00, Subject 140 of
the Century Class Trucks Workshop Manual.

5.

Inspect the compressor clutch coil wire. Check
that the connector is not damaged or loose. Re-
place the wire if it is damaged.

6.

Check the overall condition of the air conditioning
hoses. Look for cracks, cuts, and abrasions on
the hoses. Replace damaged hoses. Check for
loose fittings on all of the air conditioning compo-
nents.

7.

Check for road debris buildup on the condenser
fins. Using air pressure and a whisk broom or a
soapy spray of water, carefully clean off the con-
denser. Be careful not to bend the fins.

08/25/94

f830641

Fig. 1, Drive Plate Clearance Inspection

Heater and Air Conditioner

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83–02 Air Filter Replacement

Cab Fresh Air Filter
Replacement, Water-Valve
Controlled

The cab fresh air filter must be replaced every six
months, regardless of mileage, to permit proper op-
eration of the HVAC system.

CAUTION

If the fresh air filter is not replaced every six
months, damage to the heater and air conditioner
components could occur. The HVAC system
should not be operated without the fresh air filter
installed.

IMPORTANT: When replacing the air filter, use
only a Freightliner-approved air filter.

1.

Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.

2.

Remove the two Torx® screws that secure the
HVAC air filter cover to the air intake plenum.
See

Fig. 2

.

3.

Pivot the front end of the cover out to remove
the cover, and pull the air filter out of the air in-
take plenum.

4.

Install a new air filter.

4.1

Slide a new air filter into the air intake
plenum.

NOTE: When installing the HVAC air filter,
be sure that it is oriented properly. The filter
label has an arrow that indicates the air flow
direction. See

Fig. 3

.

4.2

Install the air filter cover on the plenum
and install the two Torx screws.

5.

Remove the chocks from the tires.

Cab Fresh Air Filter
Replacement, Blend Air

If the vehicle is equipped with a cab fresh air filter, it
must be replaced every six months regardless of
mileage to permit proper operation of the HVAC
system.

CAUTION

If equipped with a fresh air filter, it should be re-
placed every six months. If the fresh air filter is

1

2

3

12/18/96

f830768

1.

HVAC Plenum

2.

Filter Cover

3.

Torx Screws

Fig. 2, HVAC Air Intake Plenum, Water-Valve Controlled

12/18/96

f830769

1

2

1.

Air Filter

2.

Air Flow Direction Arrow

Fig. 3, HVAC Air Filter, Water-Valve Controlled

Heater and Air Conditioner

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