Chrysler 300M, Dodge Interpid. Manual — part 394

tionary electromagnetic coil, a hub bearing and pul-
ley assembly, and a clutch plate. The electromagnetic
coil unit and the hub bearing and pulley assembly
are each retained on the nose of the compressor front
housing with snap rings. The clutch plate is retained
with a bolt. These components provide the means to
engage and disengage the compressor from the
engine serpentine accessory drive belt.

OPERATION

When the clutch coil is energized, it magnetically

draws the clutch into contact with the pulley and
drives the compressor shaft. When the coil is not
energized, the pulley freewheels on the clutch hub
bearing, which is part of the pulley. The compressor
clutch and coil are the only serviced parts on the
compressor.

The compressor clutch engagement is controlled by

several components: the a/c heater control head (ATC
or MTC), the evaporator temperature sensor, the a/c
pressure transducer, the compressor clutch relay, and
the Powertrain Control Module (PCM). The PCM

24 - 8

CONTROLS

may delay compressor clutch engagement for up to
thirty seconds. Refer to Electronic Control Modules
for more information on the PCM controls.

DIAGNOSIS AND TESTING - COMPRESSOR
CLUTCH COIL

For circuit descriptions and diagrams, (Refer to

Appropriate Wiring Information). The battery must
be fully-charged before performing the following
tests. Refer to Battery for more information.

(1) Connect an ammeter (0 to 10 ampere scale) in

series with the clutch coil terminal. Use a voltmeter
(0 to 20 volt scale) with clip-type leads for measuring
the voltage across the battery and the compressor
clutch coil.

(2) In A/C, mix, defrost and the blower motor

switch in the lowest speed position, start the engine
and run it at normal idle.

(3) The compressor clutch coil voltage should read

within 0.2 volts of the battery voltage. If there is
voltage at the clutch coil, but the reading is not
within 0.2 volts of the battery voltage, test the clutch
coil feed circuit for excessive voltage drop and repair
as required. If there is no voltage reading at the
clutch coil, use a DRBIII

t scan tool and (Refer to

Appropriate Diagnostic Information) for testing of the
compressor clutch circuit. The following components
must be checked and repaired as required before you
can complete testing of the clutch coil:

• Fuses in the junction block and the Power Dis-

tribution Center (PDC)

• A/C heater control head

• Compressor clutch relay

• A/C pressure transducer

• Evaporator temperature sensor

• Powertrain Control Module (PCM).
(4) The compressor clutch coil is acceptable if the

current draw measured at the clutch coil is approxi-
mately 2.2 amperes with the electrical system volt-
age at 11.5 to 12.5 volts. This should only be checked
with the work area temperature at 21° C (70° F). If
system voltage is more than 12.5 volts, add electrical
loads by turning on electrical accessories until the
system voltage drops below 12.5 volts.

(a) If the clutch coil current reading is four

amperes or more, the coil is shorted and should be
replaced.

(b) If the clutch coil current reading is zero, the

coil is open and should be replaced.

STANDARD PROCEDURE

INSPECTION

Examine the friction surfaces of the clutch pulley

and the front plate for wear. The pulley and front
plate should be replaced if there is excessive wear or
scoring.

If the friction surfaces are oily, inspect the shaft

and nose area of the compressor for oil. Remove the
felt from the front cover. If the felt is saturated with
oil, the shaft seal is leaking and the compressor must
be replaced.

Check the clutch pulley bearing for roughness or

excessive leakage of grease. Replace the bearing, if
required.

STANDARD PROCEDURE - A/C COMPRESSOR
CLUTCH BREAK- IN

After new clutch installation, cycle the A/C clutch

20 times (5 seconds ON and 5 seconds OFF). During
this procedure, set the system to the A/C mode,
engine rpm at 1500-2000, and high blower speed.
This procedure (burnishing) will seat the opposing
friction surfaces and provide a higher clutch torque
capability.

NOTE: Excessive clutch gap will result in clutch
slippage or non-engagement.

REMOVAL

The refrigerant system can remain fully-charged

during compressor clutch, pulley, or coil replacement.
The compressor clutch can be serviced in the vehicle.

(1) Disconnect and isolate the battery negative

cable.

(2) Remove the serpentine drive belt(Refer to 7 -

COOLING/ACCESSORY

DRIVE/DRIVE

BELTS

REMOVAL) or (Refer to 7 - COOLING/ACCESSORY
DRIVE/DRIVE BELTS - REMOVAL).

(3) Unplug the compressor clutch coil wire harness

connector.

(4) Remove the bolts that secure the compressor to

the mounting bracket.

(5) Remove the compressor from the mounting

bracket. Support the compressor in the engine com-
partment while servicing the clutch.

(6) Remove the compressor shaft bolt (Fig. 1). A

band type oil filter removal tool can be placed around
the clutch plate to aid in bolt removal.

(7) Tap the clutch plate with a plastic hammer and

remove clutch plate and shim(s) (Fig. 2).

CAUTION: Do not use screwdrivers between the
clutch plate assembly and pulley to remove front
plate as this may damage the front plate assembly.

CONTROLS

24 - 9

A/C COMPRESSOR CLUTCH (Continued)

(8) Remove pulley retaining snap ring with Snap

Ring Pliers (C-4574), and slide pulley assembly off of
compressor (Fig. 3).

(9) Remove coil wire bracket/ground clip screw and

wire harness.

(10) Remove snap ring retaining field coil onto

compressor housing (Fig. 4). Slide field coil off of
compressor housing.

Fig. 1 COMPRESSOR SHAFT BOLT AND CLUTCH

PLATE

1 - COMPRESSOR SHAFT BOLT
2 - COMPRESSOR CLUTCH PLATE

Fig. 2 CLUTCH PLATE AND SHIM(S)

1 - COMPRESSOR SHAFT
2 - CLUTCH PLATE
3 - CLUTCH PLATE SHIM

Fig. 3 REMOVING PULLEY SNAP RING

1 - SNAP RING

Fig. 4 CLUTCH COIL SNAP RING

1 - SNAP RING PLIERS
2 - CLUTCH COIL
3 - SNAP RING
4 - COMPRESSOR

24 - 10

CONTROLS

A/C COMPRESSOR CLUTCH (Continued)

Была ли эта страница вам полезна?

Да!Нет

8 посетителей считают эту страницу полезной.

Chrysler 300M, Dodge Interpid. Manual — part 394

Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.