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However, evaporator capacity used to reduce the amount of moisture in the air is not wasted. Wring- Review the Service Warnings and Precautions in the front of this group before performing this proce- (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 (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- (6) The compressor clutch may cycle, depending upon the ambient temperature and humidity. If the located on the accumulator (Fig. 6). Place a jumper (7) With the compressor clutch engaged, record the discharge air temperature and the compressor dis- (8) Compare the discharge air temperature to the Performance Temperature and Pressure chart. If the Performance Temperature and Pressure Ambient Air 21° C (70° F) 27° C (80° F) 32° C (90° F) 38° C (100° F) 43° C (110° F) Air Temperature at -3 to 3° C (27 to 38° F) 1 to 7° C (33 to 44° F) 3 to 9° C (37 to 48° F) 6 to 13° C (43 to 55° F) 10 to 18° C (50 to 64° F) Evaporator Inlet 179 to 241 kPa (26 to 35 psi) 221 to 283 kPa (32 to 41 psi) 262 to 324 kPa (38 to 47 psi) 303 to 365 kPa (44 to 53 psi) 345 to 414 kPa (50 to 60 psi) Compressor Discharge 1240 to 1655 kPa (180 to 240 psi) 1380 to 1790 kPa (200 to 260 psi) 1720 to 2070 kPa (250 to 300 psi) 1860 to 2345 kPa (270 to 340 psi) 2070 to 2690 kPa (300 to 390 psi) (9) Compare the compressor discharge pressure to the Performance Temperature and Pressure chart. If Fig. 6 Low Pressure Cycling Clutch Switch - Typical 1 – LOW PRESSURE CYCLING CLUTCH SWITCH 24 - 10 HEATING AND AIR CONDITIONING XJ DIAGNOSIS AND TESTING (Continued) |