freightliner 108SD 2021, Руководство пользователя

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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 or motor, 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 cannot drop. Failure to follow these
steps could result in serious personal injury or
death.
83–01 Air Conditioner
Inspection
1. With the vehicle parked on a level surface, apply
the parking brakes and chock the tires.
2. Operate the heater and, if equipped with an air
conditioner, the air conditioner to check for
proper operation in all modes.
3. Open the hood.
4. Inspect the refrigerant compressor drive belt for
damage. If needed, replace the drive belt.
5. Check the tightness of the compressor mounting
fasteners. The torque value for the mounting fas-
teners is 15 to 19 lbf·ft (20 to 26 N·m).
6. Inspect the drive plate. If the friction surface of
the drive plate shows visible signs of damage
due to excessive heat, make sure the refrigerant
compressor turns freely. If the compressor does
turn freely, replace the drive plate and clutch as-
sembly. For instructions, see
Section 83.02,
Subject 140 of the 108SD and 114SD Workshop
Manual . If the compressor does not turn freely,
replace the compressor. For instructions, see
Section 83.02, Subject 120 of the 108SD and
114SD Workshop Manual
7. Use a feeler gauge to check that the drive plate
clutch clearance is 0.016 to 0.031 inch (0.4 to
0.8 mm). Check the gap at three equally spaced
locations on the drive plate, and average the
measurements to account for pulley misalign-
ment. If the overall gap is out of spec, remove
the drive plate assembly and change the shims
as necessary. For instructions, see Section
83.02, Subject 140 of the 108SD and 114SD
Workshop Manual .
8. Check that the wiring harness connector is not
damaged or loose. Replace the wiring harness if
it is damaged.
9. Check the overall condition of the air conditioning
hoses. Look for cracks, cuts, and abrasions on
the hoses. Replace damaged hoses.
10. Check for a buildup of road debris on the con-
denser fins. Using air pressure and a whisk
broom or a soapy spray of water, carefully clean
off the condenser. Be careful not to bend the
fins.
83–02 HVAC Air Filter
Replacement
The HVAC air filter must be replaced every six
months or 60,000 miles (97 000 km) to permit proper
operation of the HVAC system.
1. With the vehicle parked, apply the parking
brakes, and chock the tires.
2. Remove the lower HVAC cover in the cab. For
instructions, see
Group 60 of the 108SD and
114SD Workshop Manual .
3. Disconnect the wiring harness from the evapora-
tor probe.
4. Remove the capscrews that attach the evapora-
tor service cover to the HVAC assembly. Remove
the evaporator service cover.
5. Pull the filter out of the HVAC assembly.
6. Install a new filter in the HVAC assembly. Be
sure that the arrow on the filter is pointing toward
the evaporator. See
Fig. 1 .
7. Remove the condensate seal from the evapora-
tor service cover and install a new condensate
seal on the cover.
8. Using capscrews, attach the evaporator service
cover to the HVAC assembly.
9. Connect the wiring harness to the evaporator
probe.
10. Attach the lower HVAC cover to the dash panel.
For instructions, see Group 60 of the 108SD and
114SD Workshop Manual .
Heater and Air Conditioner
83
108SD and 114SD Maintenance Manual, September 2015
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