System Performance Test

Pressure-Temperature Relationship Of R-134a:

System Performance Test:

PERFORMANCE TEST
Prior to the performance test, a functional test should be performed. Refer to Functional Test. Functional Test/Check

Tool Required:

- J 21213-A Four Jack-Dual Range Temperature Tester or Equivalent

1. Park vehicle inside or in a shaded area.

2. Open doors or windows to ventilate interior.

3. Vent engine exhaust, if necessary.

4. Open hood and install high and low side pressure gages. Route lines over rear hood seal, and tape gages to windshield for viewing.

5. Close hood to safety latch position.

6. Record ambient temperature at vehicle.

7. Record relative humidity. Use psychrometer or consult local weather bureau.


IMPORTANT: Be sure to record relative humidity and ambient temperature conditions at time of test.

8. Close doors or windows.

9. Set mode control to "MAX A/C," adjust blower speed to "HI," and temperature to full "Cold."

10. Open air conditioning outlets.

11. Install J 21213-A or equivalent into right center air conditioning outlet.

12. Place transmission in "PARK" or "NEUTRAL."

13. Start engine, stabilize engine speed at 1500 RPM, and start the timer.

14. Run the air conditioning system until outlet air reaches the lowest temperature (about 3 minutes).

15. Record outlet air temperature and high-side and low-side pressures.

16. Turn the engine off and compare the readings. Normally operating air conditioning systems should not exceed the levels shown (see accompanying figures).



Inspect

If a malfunction in the refrigerant system is suspected due to abnormal system pressures, continue with diagnostic procedures under Insufficient Cooling Diagnosis. Symptom Related Diagnostic Procedures