Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual - part 188
VARIABLE DISPLACEMENT COMPRESSOR—MODEL 6C17
INDEX
page
page
Clutch Coil Tests
. . . . . . . . . . . . . . . . . . . . . . . . . 17
Compressor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Compressor Clutch Inoperative
. . . . . . . . . . . . . . 13
Compressor Clutch/Coil Assembly
. . . . . . . . . . . . 19
Compressor Diagnosis
. . . . . . . . . . . . . . . . . . . . . 13
Compressor Front Shaft Seal
. . . . . . . . . . . . . . . 20
Compressor High Pressure Cut-Out Switch
. . . . . 21
Compressor High Pressure Relief Valve (HPR)
. . 22
Compressor Identification
. . . . . . . . . . . . . . . . . . . 13
Compressor Main or Sub Control Valves
. . . . . . . 22
Compressor Noise
. . . . . . . . . . . . . . . . . . . . . . . . 13
General Information
. . . . . . . . . . . . . . . . . . . . . . . 13
GENERAL INFORMATION
The Variable Displacement Compressor (VDC) pro-
vides maximum A/C performance under most condi-
tions. It is designed to operate continuously without
any cycling of the compressor clutch. The compressor
has a variable angle wobble plate with six axially
oriented cylinders.
During vehicle A/C system operation, the compres-
sor will change its displacement to match the vehi-
cles A/C cooling demands. When the A/C system
needs more cooling capacity, the compressor will in-
crease its pumping capacity. This is done by increas-
ing the wobble plate angle to increase the piston
stroke. When the A/C system cooling demand is low,
the compressor will decrease its pumping capacity by
reducing the piston pumping stroke. The low cooling
capacity will prevent evaporator from freezing.
COMPRESSOR IDENTIFICATION
The Variable Displacement Compressor can be
identified by the location of the high pressure line. It
is mounted to the end of the compressor case (Fig. 1).
COMPRESSOR DIAGNOSIS
(1) Verify that refrigerant system is at full charge.
Refer to the Refrigerant Service Procedures section
in this Group.
(2) Perform A/C Performance Test. Refer to Heater
and A/C Performance Test section in this Group.
(3) If performance is not acceptable, perform ex-
pansion valve tests. Refer to Expansion Valve Tests
in this section.
(4) If expansion valve test is correct, refer to the
Variable Displacement Compressor Diagnosis charts.
COMPRESSOR NOISE
Excessive noise that occurs when the air condition-
ing is being used, can be caused by:
• Loose bolts
• Mounting brackets
• Loose clutch
• Excessive high refrigerant system operating pres-
sure
Verify compressor drive belt condition, proper re-
frigerant charge and head pressure before compressor
repair is performed.
For noise diagnostic procedures, refer to the Com-
pressor Noise and Compressor Clutch Diagnosis
chart in this section.
COMPRESSOR CLUTCH INOPERATIVE
The air conditioning compressor clutch electrical
circuit is controlled by the engine controller. The
controller is located in the engine compartment out-
board of the battery.
If the compressor clutch does not engage:
Verify refrigerant charge. Refer to Refrigerant Ser-
vice Procedures in this section.
If the compressor clutch still does not engage:
Check for battery voltage at the differential pres-
sure cut-off switch located on the expansion valve. If
voltage is not detected, refer to:
(1) Group 8W, Wiring Diagrams.
Fig. 1 Variable Displacement Compressor—Model
6C17
Ä
HEATING AND AIR CONDITIONING
24 - 13