Chrysler Vehicle User Manual page 1571

24 - 6 HEATING & AIR CONDITIONING
HEATING & AIR CONDITIONING (Continued)
Although, an owner may expect too much from their
air conditioning system on humid days. A perfor-
mance test is the best way to determine whether the
system is performing up to standard. This test also
provides valuable clues as to the possible cause of
trouble with the air conditioning system.
Review the Service Warnings and Precautions in
the front of this group before performing this proce-
dure. The air temperature in the test room and in
the vehicle must be a minimum of 21° C (70° F) for
this test.
(1) Connect a tachometer and a manifold gauge
set.
(2) Set the heater-A/C mode control switch knob in
the Recirculation Mode position, the temperature
control knob in the full cool position, and the blower
motor switch knob in the highest speed position.
(3) Start the engine and hold the idle at 1,000 rpm
with the compressor clutch engaged.
(4) The engine should be at operating temperature.
The doors and windows must be open.
(5) Insert a thermometer in the driver side center
A/C (panel) outlet. Operate the engine for five min-
utes.
(6) The compressor clutch may cycle, depending
upon the ambient temperature and humidity. If the
clutch cycles, unplug the low pressure cycling clutch
switch wire harness connector from the switch
located on the accumulator (Fig. 2). Place a jumper
wire across the terminals of the low pressure cycling
clutch switch wire harness connector.
Ambient Air
Temperature
Air Temperature at
Center Panel Outlet
Evaporator Inlet
Pressure at Charge
Port
Compressor Discharge
Pressure
(9) Compare the compressor discharge pressure to
the Performance Temperature and Pressure chart. If
Performance Temperature and Pressure
21° C 27° C
(70° F) (80° F)
-3 to 3° C 1 to 7° C
(27 to 38° F) (33 to 44° F)
221 to 283
179 to 241 kPa
(26 to 35 psi)
(32 to 41 psi)
1240 to 1655 1380 to 1790
kPa
(180 to 240 (200 to 260
psi)
Fig. 2 Low Pressure Cycling Clutch Switch - Typical
1 - LOW PRESSURE CYCLING CLUTCH SWITCH
2 - ACCUMULATOR
(7) With the compressor clutch engaged, record the
discharge air temperature and the compressor dis-
charge pressure.
(8) Compare the discharge air temperature to the
Performance Temperature and Pressure chart. If the
discharge air temperature is high (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING -
STANDARD PROCEDURE).
32° C
(90° F)
3 to 9° C
(37 to 48° F)
262 to 324
kPa kPa
(38 to 47 psi)
1720 to 2070
kPa kPa
(250 to 300
psi) psi)
the compressor discharge pressure is high, see the
Pressure Diagnosis chart.
38° C 43° C
(100° F) (110° F)
6 to 13° C 10 to 18° C
(43 to 55° F) (50 to 64° F)
303 to 365
345 to 414 kPa
kPa
(50 to 60 psi)
(44 to 53 psi)
1860 to 2345
2070 to 2690
kPa
kPa
(270 to 340
(300 to 390 psi)
psi)
TJ