Component Tests and General Diagnostics

AIR CONDITIONING: REFRIGERANT: ON-VEHICLE INSPECTION

1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

(a) This is a method to specify trouble areas by using a manifold gauge set. Read the manifold gauge pressure when the following conditions are established.

Test conditions:

* Engine has been warmed up.

* All doors are fully open.

* A/C switch is ON.

* Engine is running at 1,500 rpm.

* Air inlet mode selector damper is set at recirculation.

* Temperature control switch is in MAX. COLD position.

* Blower speed control switch is in HI position.

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

Gauge readings (Reference)





(1) When the refrigerant volume is proper:





Gauge reading:

Low pressure side:

0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm2)

High pressure side:

1.37 to 1.57 MPa (14 to 16 kgf/cm2)

(2) When there is moisture in the refrigeration system:









(3) When cooling is insufficient:









(4) When the circulation of the refrigerant is poor:









(5) When the refrigerant does not circulate:









(6) When the refrigerant is overcharged or cooling of condenser is insufficient:









(7) When there is air in the refrigeration system:









(8) When the expansion valve malfunctions:









When the compressor is defective: