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.
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.
08/25/94
f830641
Fig. 1, Drive Plate Clearance Inspection
Heater and Air Conditioner 83
Century Class Trucks Maintenance Manual, April 2003 83/1
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