A/C System Performance Test - HVAC System - Automatic

System Performance Test:

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

1. Park the vehicle inside or in the shade. The ambient temperature must be at least 16°C (60°F).
2. Open the windows in order to ventilate the interior.
3. Vent the engine exhaust.
4. Open the hood and install the J 391B3-C.
5. Record the ambient temperature where the vehicle is parked.
6. Record the relative humidity. Use a psychrometer or consult the local weather bureau.
7. Close all of the doors and the windows. Lower the hood.
8. Set the A/C control assembly to MAX mode with the blower speed set to high and the temperature to full cold. Ensure the vent button LED is not illuminated
9. Open the A/C air outlet deflectors.
10. Place a thermometer in the left center A/C outlet.
11. Place the transaxle in PARK. Start the engine. Let the engine idle.
12. Run the A/C system until the outlet air reaches a stabilized temperature (about 3 minutes).
13. Record the outlet air temperature and the high side and low side pressures.
14. Turn the engine off and compare the readings with the data in the A/C Performance Table. Normally operating A/C systems should not exceed levels shown.
15. If the readings exceed the table limits, refer to High Side vs. Low Side Pressure Table High Side vs. Low Side Pressure Chart - HVAC System - Automaticand Gray Area Diagnosis A/C System Pressure Zone Diagnosticsand Service in Cooling Insufficient. Cooling Insufficient - A/C Inoperative
16. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of the test.