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.
01/13/2010
f831825
1
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
Heater and Air Conditioner
83
122SD and Coronado 132 Maintenance Manual, February 2016
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