Refrigerant

HEATING / AIR CONDITIONING: REFRIGERANT: ON-VEHICLE INSPECTION

1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

(a) This method uses a manifold gauge set to locate problem areas. Read the manifold gauge pressure when these conditions are established.

Test conditions:

* Temperature the air inlet is 30 to 35°C (86 to 95°F).

* Engine is running 1500 rpm.

* All doors are fully open.

* Blower speed control switch is set to HI.

* Air inlet control set to RECIRC.

* A/C switch is on.

(b) Gauge readings (Reference)





(1) Normally functioning refrigeration system.





Gauge Reading:





(2) The A/C system periodically changes between normal and improper function due to moisture in the refrigerant system.









(3) The A/C system does not function effectively due to insufficient refrigerant.









(4) The A/C system does not function effectively due to poor circulation of the refrigerant.









(5) The A/C system does not function or functions intermittently because the refrigerant does not circulate.









(6) The A/C system does not function effectively due to overcharged refrigerant or insufficient cooling of the condenser.









(7) The A/C system does not function due to air in the refrigeration system.

CAUTION:
The low-pressure piping may be very hot and cause serious burns.









(8) The A/C system does not function effectively due to an expansion valve malfunction.









(9) The A/C system does not function due to a defective compressor.