Jeep 1996 Grand Cherokee Service Manual - page 1401
(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 left center A/C
(panel) outlet. Operate the engine for five minutes.
(6) The compressor clutch may cycle, depending
upon the ambient temperature and humidity. If the
clutch cycles, remove the low pressure cycling clutch
switch connector from the switch located on the accu-
mulator (Fig. 7). Place a jumper wire across the ter-
minals of the low pressure cycling clutch switch
connector.
(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, see Refrigerant
System Leaks and Refrigerant System Charge in this
group.
(9) Compare the compressor discharge pressure to
the Performance Temperature and Pressure chart. If
the compressor discharge pressure is high, see the
Pressure Diagnosis chart.
Performance Temperature and Pressure Chart
Fig. 6 16-Way Connector
Fig. 7 Low Pressure Cycling Clutch Switch
24 - 10
HEATING AND AIR CONDITIONING
ZJ
DIAGNOSIS AND TESTING (Continued)