Freightliner Coronado 132 / 122SD. Manual — part 31
Title of Maintenance Operation (MOP)
MOP Number
Air Conditioner Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–01
Air Filter Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–02
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–00
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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
NOTE: The following procedure applies to an air
conditioner system with a Denso compressor.
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.
1.
Park the vehicle on a level surface, apply the
parking brakes, and chock the tires.
2.
Inspect the A/C compressor hub. A torn or
melted rubber dampener (center section) indi-
cates internal damage has occurred within the
compressor. Inspect friction surfaces for wear,
oil-soaked condtions, or discoloration due to ex-
cessive heat.
3.
With the belt removed, check to make sure that
the rotor (pulley) spins freely. It should not
wobble or make contact with the hub when it is
spinning. The average air gap between the hub
and rotor should be 0.014 to 0.024 inch (0.35 to
0.6 mm). Check the gap at several locations and
average the results. See
4.
Check the overall condition of the air conditioning
hoses. Look for cracks, cuts, and abrasions on
the hoses. Replace damaged hoses. For re-
placement instructions, see Group 83 of the
122SD and Coronado Workshop Manual. Also
check for signs of loose fittings on all of the air
conditioning components.
83–02 Air Filter Replacement
The HVAC system has three filters that must be re-
placed periodically to maintain proper system opera-
tion. The cabin fresh-air-intake filter is accessed from
under the hood, and the recirculation filter is ac-
cessed from inside the cab. The sleeper air filter is
located under the bunk.
Cab Fresh Air Filter Replacement
NOTICE
If equipped with a fresh air filter, it should be re-
placed every six months, more often if the vehicle
is operated under extreme conditions. If the fresh
air filter is not replaced at proper intervals, dam-
age to the heater and air conditioner components
could occur.
IMPORTANT: When replacing the air filter, use
only a Freightliner-approved air filter.
1.
Apply the parking brakes and chock the tires.
2.
Lift the wire retainer on the air filter cover up and
over the upper edge of the cover and pull the
wire retainer down; see
3.
Note the direction of the arrow on the air filter
cover, then remove the cover and the attached
filter.
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2
A
A. Gap Dimension: 0.014 to 0.024 inch (0.35 to 0.60
mm)
1.
Hub
2.
Rotor Magnetic Clutch
Fig. 1, Hub/Rotor Gap
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4.
Remove the air filter from the air filter cover. Dis-
card the air filter.
5.
Attach a new air filter to the air filter cover. Make
sure the arrow on the filter is pointing in the
same direction as the arrow on the cover.
6.
Install the air filter and air filter cover in the
HVAC air intake plenum.
7.
Pull the wire retainer up and over the upper edge
of the air filter cover.
Cab Recirculation Air Filter
Replacement
The cab recirculation air filter must be replaced every
six months, regardless of mileage, to permit proper
operation of the HVAC system. The filter can be ac-
cessed by removing the dash lower console. See
NOTICE
If the recirculation air filter is not replaced every
six months, damage to the heater and air condi-
tioner components could occur. The HVAC system
should not be operated without the recirculation
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 dash lower console. The lower con-
sole is secured by nine Torx screws; see
3.
Remove the retainer that holds the recirculation
air filter in place; see
4.
Remove and discard the recirculation air filter.
5.
Install a new recirculation air filter in the retainer.
6.
Install the retainer in the HVAC assembly; see
7.
Install the dash lower console. Tighten the Torx
screws 24 to 30 lbf·in (270 to 340 N·cm). See
Sleeper Air Filter Replacement
Replace the air filter in the sleeper HVAC unit every
six months, regardless of mileage. The filter should
not be cleaned.
NOTICE
If the sleeper 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 recirculation
air filter installed.
1.
Turn off the engine, apply the brakes, and chock
the tires.
2.
Access the sleeper HVAC assembly by raising
the mattress and bunk panel to the locked posi-
tion. If there is a baggage compartment, the
sleeper HVAC assembly may be accessed
through the baggage door on the right side of the
vehicle.
3.
Slide the air filter out of the sleeper HVAC as-
sembly; see
4.
Place a new air filter in the sleeper HVAC as-
sembly. The edge of the filter should be flush
with the HVAC assembly.
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2
1.
Air Filter Cover
2.
Wire Retainer
Fig. 2, HVAC Air Intake Plenum
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3
2
2
2
2
2
2
2
2
2
f611065
1.
Cab Recirculation Air Filter
2.
Torx Screw
3.
Dash Lower Console
Fig. 3, Cab Recirculation Air Filter Location
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2
1.
Retainer
2.
Recirculation Air Filter
Fig. 4, Cab Recirculation Air Filter
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1.
Air Filter
Fig. 5, Sleeper HVAC Assembly
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