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2. Connect a tachometer and a manifold gauge set. NOTE: The ambient air temperature of the vehicle and the location where the vehicle will be tested must be 3. Set the A/C-heater control to the Recirculation mode (max-A/C) position, the temperature control to the full cool position, and the blower motor control to the highest speed position. 4. Start the engine and hold the idle at 1,000 rpm with the compressor clutch engaged. If the A/C compressor does not engage, see the A/C Pressure Diagnosis chart. 5. The engine should be at operating temperature and the doors and the windows closed. 6. Insert a thermometer in the driver side center panel outlet. Operate the A/C system until it stabilizes. 7. With the A/C compressor clutch engaged, compare the air temperature at the center panel outlet and the com- pressor discharge pressure (high side) to the A/C Performance and Pressure chart. The compressor clutch may A/C PERFORMANCE TEMPERATURE AND PRESSURE Ambient Air Temperature 21°C (70°F) 27°C (80°F) 32°C (90°F) 38°C (100°F) 43°C (110°F) Maximum Allowable Air 9°C (48°F) 9°C (48°F) 12°C (54°F) 15°C (59°F) 18°C (65°F) Suction Pressure at Service 138 to 310 kPa (20 to 45 psi) 138 to 345 kPa (20 to 50 psi) 207 to 365 kPa (30 to 55 psi) 207 to 414 kPa (30 to 60 psi) 241 to 448 kPa (35 to 65 psi) Discharge Pressure at Service 1034 to 1724 kPa (150 to 250 psi) 1379 to 2068 kPa (200 to 300 psi) 1551 to 2241 kPa (225 to 325 psi) 1724 to 2413 kPa (250 to 350 psi) 2068 to 2758 kPa (300 to 400 psi) 8. If the air outlet temperature fails to meet the specifications in the A/C Performance Temperature and Pressure chart, or if the compressor discharge pressure is high, refer to the A/C Pressure Diagnosis chart. A/C PRESSURE DIAGNOSIS Condition Possible Causes Correction Rapid A/C compressor clutch 1. Low refrigerant system 1. See Refrigerant System Leaks in this group. 24 - 110 HVAC - SERVICE INFORMATION ND |