Refrigerant: Testing and Inspection

REFRIGERANT

ON-VEHICLE INSPECTION

1. INSPECT REFRIGERANT VOLUME

a. Check the sight glass on the cooler refrigerant liquid pipe A.

Test conditions:
- Engine is running at 1,500 rpm
- Blower speed control switch is at "HI"
- A/C switch is ON
- Temperature control dial is at "MAX. COOL"
- Doors are fully open

2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
a. This is a method in which the trouble is located by using a manifold gauge set. Read the manifold gauge pressure when these conditions are established.

Test conditions:
- Temperature at the air inlet with the switch set at RECIRC is 30 to 35 degree C (86 to 95 degree F)
- Engine is running at 1,500 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:
Low pressure side: 0.15 to 0.25 MPa (1.5 to 2.5 kgf/sq.cm)
High pressure side: 1.37 to 1.57 MPa (14 to 16 kgf/sq.cm)