A/C Less Time Delay

FAULT-TRACING HINTS

As a general rule, the supply to the unit is live when the ignition switch is in the drive position. If none of the components are faulty, check the cable harnesses, connectors and earth connections.

Compressor And Radiator Fan Motor 37

1. Check fuses 6 and 25 and check that the supply to AC switch 169 and relay 156 is live.

2. Press the AC switch. Measure the voltage across pressure switch 166 (the pressure switch should be closed). Note that refrigerant will spray out when the pressure switch is disconnected.

Caution: Risk of frostbite.

3. Check cycling clutch contact 171. (It should close at +6 °C.)

4. Check relay 156 and check that switches 167 and 168 in the earth circuit of the relay are closed when the engine is idling and at normal engine temperature, respectively.

5. Check that the supplies to the compressor and the radiator fan are live.

AC Radiator Fan 172

1. Check fuse 6 and check that the supplies to the AC switch and to relay 155 are live.

2. Press the AC switch. Measure the voltage across pressure switch 166 (the pressure switch should be closed). Note that refrigerant will spray out when the pressure switch is disconnected.

Caution: Risk of frostbite.

3. Check that relay 155 is energised and that the the supply to the AC radiator fan is live.

Recirculation

1. Check fuse 6 and check that the supply to recirculation switch 143 is live.

2. Press the switch and check that the recirculation valve is activated.

3. Check fuse 9 and check that the supply to main switch 149 in the air distribution control is live.

4. When the control is in position O or Fresh Air (AC Max), the recirculation valve should be activated.