900 L4-2118cc 2.1L DOHC (1992)
Compressor HVAC: Testing and Inspection
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 is faulty, check the cable
harnesses, connectors and earth connections.
Compressor 170 And Radiator Fan Motor 37
1. Check fuses 6 and 25 and check that the supplies to AC switch 169 and relay 156 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 cycling clutch contact 171. (It should close at +6 °C or 43 °F.)
4. Check that the relay is energised and that the relay contacts (87 and 87A) are live. If not, check that the coil/electronics are being supplied from
thermostat 171 and from the +15 distribution terminal. When the relay is energised, terminal 16 should be live. At full throttle, terminal TK should
be earthed.
5. Check that the supplies to the compressor and the radiator fan are live. (Temperature switch 168 should be closed.)