On Vehicle Inspection

ON-VEHICLE INSPECTION
This is a method in which the trouble is located by using a manifold gauge set. Read the manifold gauge pressure when the these conditions are established

TEST CONDITIONS
- Temperature at the air inlet with the switch set at RECIRC is 30-35 °C (86-95 °F)
- Engine running at 1,500 rpm
- Blower speed control knob on "4" position
- Temperature control knob on "COOL" position

NOTE: It should be noted that the gauge indications may vary slightly due to ambient temperature conditions.




1. Normally functioning refrigeration system.

Gauge reading:

Low pressure side:
0.15-0.25 MPa (21.8-36.3 psi, 1.5-2.5 kgf/sq.cm)

High pressure side:
1.37-1.57 MPa (199-228 psi, 14-16 kgf/sq.cm)




2. Moisture present in refrigeration system.




3. Insufficient cooling




4. Poor circulation of refrigerant




5. Refrigerant does not circulate




6. Refrigerant overcharged or insufficient cooling of condenser

Low Pipe Hot:

7. Air present in refrigeration system

Low Pipe Too Cold:

8. Expansion valve improperly




9. Defective compression compressor