Refrigerant: Testing and Inspection

REFRIGERANT

ON-VEHICLE INSPECTION

1. INSPECT REFRIGERANT VOLUME

a. Check the sight glass on the air conditioning tube & accessory assembly.

1. Prepare the vehicle according the chart.

2. Compare the sight glass to the given chart.

2. 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 these conditions are established.

Test conditions:
- Temperature at the air inlet with the switch set at RECIRC is 30 to 35 degrees C (86 to 95 degrees 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
- Ignition switch in a position that enables the AC compressor to run.

1. Normally functioning refrigeration system Gauge reading:

Low pressure side:
0.15 to 0.25 MPa (1.5 to 2.5 kgf/sq.cm, 21.3 to 35.5 psi)

High pressure side:
1.37 to 1.57 MPa (14 to 16 kgf/sq.cm, 199.1 to 227.5 psi)