Evaporator Temperature Sensor / Switch: Testing and Inspection

CAUTION: The work area and vehicle must be between 21°C (70°F) and 32°C (90°F) when testing the switch.

1. Disconnect the 3-wire connector from switch lead located behind the glove box.

Fig. 2 Fin-sensing Cycling Clutch Switch Harness Connector 16:

2. Test for voltage between pin #1 to pin #3 on the wire harness connector. If voltage is detected, jump pin #1 to pin #3 using a jumper wire. Compressor clutch should engage.
3. Check for voltage between pin #1 and pin #2. If no voltage is detected, check fuse and ground circuit.
4. If compressor clutch engages, test for continuity from terminal pin #1 to pin #3 of the switch lead connector. Continuity should be detected. If not, replace the Fin-sensing Cycling Clutch Switch.