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Air Conditioning (A/C) System Performance Test: Notes

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Important:  Record the ambient temperature conditions and the relative humidity at the time of the test.

  1. Park the vehicle inside or in the shade. The ambient temperature must be at least 21°C (70°F).
  2. Open the windows in order to ventilate the interior.
  3. Vent the engine exhaust.
  4. Open the hood and install the high and low side pressure gauges of the J 39183-C  .
  5. Route the pressure gauge hoses and close the hood to the safety latch position.
  6. Record the ambient temperature outside.
  7. Record the relative humidity.
  8. Turn the A/C on, set the mode to the VENT position, the temperature to the coldest position, the fresh/recirc to recirculation, the blower speed to high and open the windows.
  9. Open the A/C air outlet deflectors.
  10. Place a J 6742-03  thermometer in the left center A/C outlet.
  11. Place the transaxle in PARK and start the engine, stabilize the engine at 1500 RPM.
  12. Run the A/C system about 5 minutes or until the outlet air reaches the lowest temperature.
  13. Record the outlet air temperature and the high side and the low side pressures.
  14. Turn the engine off and compare the readings with the data in the A/C Performance Table. A normally operating A/C system should not exceed levels shown. If the readings exceed the table limits, refer to TXV Air Conditioning (A/C) System Diagnosis (Insufficient Cooling)  or TXV AIR CONDITIONING (A/C) SYSTEM DIAGNOSIS (REFERENCE TABLE) . Also refer to SYMPTOMS - HVAC SYSTEMS - MANUAL in HVAC Systems - Manual.
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