Refrigerant

HEATING / AIR CONDITIONING: REFRIGERANT: ON-VEHICLE INSPECTION

1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

HINT
This is a method where a manifold gauge set is used to help locate the problem.

(a) Read the manifold gauge pressure when the following conditions are established.

Test conditions:

* Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F).

* Engine is running at 1500 rpm.

* Blower speed control switch is at "HI".

* Temperature control dial is at "COOL".

* A/C switch is ON.

* Doors are fully open.

(1) Normally functioning refrigeration system





Gauge Reading





(2) Moisture is present in refrigeration system.









(3) Insufficient cooling









(4) Poor circulation of refrigerant









(5) Refrigerant does not circulate.









(6) Refrigerant is overcharged or cooling effectiveness of the condenser is insufficient.









(7) Air is present in the refrigeration system.









(8) Expansion valve malfunction









(9) Insufficient compressor compression









Gauge readings (Reference)