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with the A/C system. The ambient air temperature in the location where the vehicle will be tested must be a mini- A/C PERFORMANCE TEST WARNING: Refer to the applicable warnings and cautions for this system before performing the following NOTE: When connecting the service equipment coupling to the line fitting, verify that the valve of the cou- NOTE: The work area ambient temperature must be above 16° C (60° F) and the evaporator temperature 1. Conduct the A/C System Performance Test (Cooldown Test) found within the HVAC System Test (refer to 24 - HVAC Electrical Diagnostics). If no diagnostic trouble codes (DTCs) are found in the A/C-heater control or the 2. Connect a tachometer and a manifold gauge set or an A/C recycling/charging station. 3. Operate the heating-A/C system under the following conditions. • Engine at 1,000 rpm at operating temperature • Doors and windows closed • Transmission in Park • A/C-heater controls set to Recirculation mode (max-A/C), full cool, panel mode, high blower and with A/C com- 4. Insert a thermometer in the driver side center panel air outlet and operate the A/C system until the thermometer temperature stabilizes. 5. With the A/C compressor clutch engaged, compare the air temperature at the center panel outlet and the A/C compressor discharge pressure (high side) to the A/C Performance Temperature and Pressure chart. The com- 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 207 kPa (20 to 30 psi) 138 to 207 kPa (20 to 30 psi) 207 to 276 kPa (30 to 40 psi) 207 to 276 kPa (30 to 40 psi) 241 to 310 kPa (35 to 45 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) 6. If the air outlet temperature fails to meet the specifications in the A/C Performance Temperature and Pressure chart, or if the A/C compressor discharge pressure is high, refer to the A/C System Diagnosis chart. 24 - 330 HVAC - SERVICE INFORMATION LX |