Component Tests and General Diagnostics

AIR CONDITIONING: REFRIGERANT: ON-VEHICLE INSPECTION

1. CHECK REFRIGERANT PRESSURE USING MANIFOLD GAUGE SET

(a) This is a method to identify trouble areas by using a manifold gauge set. Read the manifold gauge pressure under the following conditions.

Test conditions:

* Engine warm.

* All doors fully open.

* A/C switch ON.

* Blower speed control switch at HI.

* Engine running at 1,500 rpm.

* Air inlet mode damper set at recirculation.

* Temperature control lever in MAX. COLD position.

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

(1) When the refrigerant volume is correct, the gauge reading indicates as follows:





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)

HINT
Pressure varies in accordance with certain conditions (outside air temperature, sunlight and wind).

(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:









2. INSPECT IDLING SPEED

(a) Warm up the engine.

(b) Inspect the idling speed when these conditions are established.

* Engine warm

* Blower speed control switch at HI

* Temperature control lever in MAX. COLD position

Standard:





If the idling speed is not as specified, check the idle control system.