Functional Check (HVAC)

Functional Test
To aid in determining whether or not the electrical, vacuum, and refrigeration Systems are operating properly, refer to the following:
1. Operation of the air conditioning modes and blower at all speeds with the mode lever in any position except OFF and engagement of the compressor clutch would indicate that the electrical circuits are operating properly.
2. The same hand felt temperature of the evaporator inlet pipe and the accumulator surface of an operating system would indicate a properly charged system.

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 the hood and install high and low side pressure gauges. Route the lines over the rear hood seal, and tape the gauges to the windshield for viewing.
5. Close the hood to the safety latch position.
6. Record the ambient temperature at the 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 1,500 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.