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Humidity has an important bearing on the temperature of the air delivered to the interior of the vehicle. It is impor- However, evaporator capacity used to reduce the amount of moisture in the air is not wasted. Wringing some of the 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- 1. Perform the A/C System Performance 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 powertrain control 2. Connect a tachometer and a manifold gauge set. 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 Diagnosis chart. 5. The engine should be at operating temperature, the doors should be closed and the windows opened. 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 A/C compressor discharge pressure (high side) to the A/C Performance and Pressure chart. The compressor clutch 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) 8. 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 Pressure Diagnosis chart. 24 - 372 HVAC - SERVICE INFORMATION WK |