Freightliner Cargo Maintenance Instruction - page 24

72–01 Weatherstrip, Door

Latch, and Door Hinge
Lubrication

Lightly coat the door weatherstrips with a lubricant
that is safe (as recommended by the lubricant manu-
facturer) on rubber.

Apply a few drops of light engine oil, or spray a light
coating of silicone lubricant (such as WD-40

®

or an

equivalent) on the door latch mechanism. This will
help reduce noise and wear. Wipe off any excess oil
or silicone lubricant.

Lubricate the door hinges and the door stop by
spraying them with a light coating of silicone lubricant
(such as WD-40 or an equivalent).

Always lubricate new cab-door hinges at installation.

Doors

72

Cargo Maintenance Manual, January 2000

72/1

Title of Maintenance Operation (MOP)

MOP Number

Air Conditioner Check, R–134a Refrigerant Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–01

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

Heater and Air Conditioner

83

Index, Alphabetical

83–01 Air Conditioner Check,

R–134a Refrigerant
Systems

Preliminary Checks

1.

Apply the parking brakes and chock the tires.

2.

Make sure the refrigerant compressor drive belt
is not damaged, and is correctly tensioned. Also
check the tightness of the compressor mounting
fasteners. For instructions and torque values,
see Group 01 of the

Cargo Workshop Manual

.

3.

Using a feeler gauge, check for correct clutch
clearance. For instructions, see Group 83 of the

Cargo Workshop Manual

.

4.

Inspect the compressor clutch coil wire. Check
the connector for damage or looseness. Replace
the wire if it is damaged.

5.

Check for broken, burst, or cut hoses. Also check
for loose fittings on all parts.

WARNING

Wear eye protection when using compressed air
or high-pressure water to clean parts, as perma-
nent harm to eyes could result from flying debris.

6.

Check for a build-up of road debris on the con-
denser fins. Using a whiskbroom and air pres-
sure, or a spray of soapy water, carefully clean
off the condenser; be careful not to bend the fins.

Cooling Check

1.

Start the engine, and set engine speed at 1500
rpm. Close the doors and windows.

IMPORTANT: When outside temperature and
humidity are high, it will take longer to cool the
cab, especially if fresh-air vents are left open.

2.

Turn on the air conditioner; set the controls at
maximum cooling and blower speed.

3.

Allow the system to run for at least 10 minutes
(longer on hot and humid days).

4.

Check air flow from the vents. If there is not
enough air flow, check the air intake vent for
blockage, and the blower motor for proper opera-
tion.

If the air flow is not cold enough, see Group 83
of the

Cargo Workshop Manual

.

5.

Carefully feel the system lines.

The compressor discharge line should feel
hot.

The condenser inlet line should be notice-
ably warmer than the outlet line.

The line from the condenser should feel
warm.

The inlet and outlet lines of the receiver-
drier should be about the same tempera-
ture.

The line from the receiver-drier to the
evaporator should feel warm.

The line from the evaporator to the com-
pressor should feel cold.

NOTE: Oily spots on the lines or at the fittings
could indicate a system leak.

Refrigerant Check

If equipped with a moisture indicator sight glass,
check the color of the moisture indicator.

If the indicator is a deep cobalt blue, the refrigerant
charge is dry.

If the indicator is

not

blue, the system is contami-

nated with water; recover the refrigerant, replace the
receiver-drier, evacuate the system, and add a full
refrigerant charge.

83–02 Air Filter Replacement

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

WARNING

The parking brake must be fully set before open-
ing the front access panel. Failure to do so could
result in serious injury.

Heater and Air Conditioner

83

83/1

1.

Open the front access panel by turning the fas-
teners at each end of the panel one-quarter turn
counterclockwise.

2.

Prop the access panel open using the support
rod.

3.

Open the two spring-loaded clamps that secure
the air filter to the HVAC assembly and remove
the air filter. See

Fig. 1

.

4.

Install a new air filter on the HVAC assembly and
secure it by closing the two spring-loaded clamps
over the air filter.

5.

Lift the access panel and release the support
rod.

6.

Secure the support rod and press the access
panel down until it locks.

11/16/2004

f831671

1

1

2

1.

Spring-loaded Clamp

2.

Air Filter

Fig. 1, Air Filter Replacement

Heater and Air Conditioner

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