Toyota RAV4 Service Manual: On-vehicle inspection

1. Inspect refrigerant pressure with manifold gauge set

1. This method uses a manifold gauge set to locate problem areas. Read the manifold gauge pressure when these conditions are established. Test conditions:

• Temperature at the air inlet is 30 to 35°c (86 to 95°f).
• Engine is running at 1,500 rpm.
• All doors are fully open.
• Blower speed control switch is at hi.
• A/c switch is on.

  Gauge readings (reference).

1. Normally functioning refrigeration system

Gauge reading v

2. The a/c system periodically changes between normal and improper function due to moisture in the refrigerant system.

3. The a/c system does not function effectively due to insufficient cooling.

4. The a/c system does not function effectively due to poor circulation of the refrigerant.

5. The a/c system does not function intermittently because the refrigerant does not circulate.

6. The a/c system does not function effectively due to overcharged refrigerant or insufficient cooling of the condenser.

7. The a/c system does not function due to air in the refrigeration system.

Caution:

The low-pressure piping may be very hot and cause serious burns.

8. The a/c system does not function effectively due to an expansion valve malfunction.

9. The a/c system does not function due to a defective compressor.