Freightliner Columbia. Manual - part 32

f720613

8/24/2005

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

Doors

Columbia Maintenance Manual, December 2011

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Title of Maintenance Operation (MOP)

MOP Number

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

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

Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Heater and Air Conditioner

Index, Alphabetical

Safety Precautions

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

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

Check the appearance of the air conditioner
compressor pulley assembly. If the friction sur-
face of the pulley shows signs of excessive
grooving due to belt slippage, replace both the
pulley and the drive plate. Inspect the refrigerant
compressor drive belt for damage and check that
the belt is set at the proper tension. Also check
the tightness of the compressor mounting fasten-
ers. For instructions and torque values, see
Group 01 of the Columbia® Workshop Manual.

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 removal and installation
procedures, see Group 83 of the Columbia®
Workshop Manual.

On a Sanden A/C compressor, use a feeler
gauge to check that the drive plate clutch clear-
ance is 0.016 to 0.030 inch (0.4 to 0.8 mm). See

Fig. 1

. If the drive plate clutch requires adjust-

ment, see Group 83 of the Columbia® Work-
shop Manual.

On a Climate Control A/C compressor, place a
feeler gauge between the air conditioner com-
pressor clutch and the pulley to check the com-
pressor clutch clearance. Drive plate to pulley
clearance is 0.020 to 0.030 inch (0.6 to 0.8 mm).
If the clearance is not correct, see Group 83 of
the Columbia® Workshop Manual.

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

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
Columbia® Workshop Manual. Also check for
loose fittings on all of the air conditioning compo-
nents.

Check for a buildup of road debris on the con-
denser fins. For cleaning instructions, see Group
83 of the Columbia® Workshop Manual.

Refrigerant Checking

Check the color of the moisture indicator on the
receiver-drier. See

Fig. 2

If the indicator is blue, the refrigerant charge is dry.

If the indicator is not blue, the system is contami-
nated with water. If the system is contaminated, the
refrigerant must be recovered and the receiver-drier
must be replaced. For instructions, see Group 83 of
the Columbia® Workshop Manual.

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, 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
not replaced every six months, damage to the
heater and air conditioner components could
occur.

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

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

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

Fig. 3

Note the direction of the arrow on the air filter
cover, then remove the cover and the attached
filter.

Remove the air filter from the air filter cover. Dis-
card the air filter.

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.

Install the air filter and air filter cover in the
HVAC air intake plenum.

Pull the wire retainer up and over the upper edge
of the air filter cover.

Remove the chocks from the tires.

Cab Recirculation Air Filter
Replacement, Blend Air

The cab recirculation air filter must be replaced every
six months, regardless of mileage, to permit proper
operation of the HVAC system.

11/21/95

f830746

Moisture Indicator

Fig. 2, Receiver-Drier

02/26/2002

f831493

Air Filter Cover

Wire Retainer

Fig. 3, HVAC Air Intake Plenum

Heater and Air Conditioner

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