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A/C Clutch Relay

NOTE: A/C clutch relay may also be referred to as A/C compressor clutch relay.

A/C clutch relay is located in Power Distribution Center (PDC). PDC is located in engine compartment. See Figure . Refer to the PDC label for relay identification and location.

The compressor clutch relay is a ISO micro-relay. The terminal designations and functions are the same as a conventional ISO relay. However, the micro-relay terminal orientation (footprint) is different, the current capacity is lower, and the relay case dimensions are smaller than those of the conventional ISO relay. The compressor clutch relay is a electromechanical device that switches battery current to the compressor clutch coil when the PCM grounds the coil side of the relay. The PCM responds to inputs from the heater-A/C mode control switch, the low pressure cycling clutch switch, and the high pressure cut-off switch. The compressor clutch relay cannot be repaired and, if faulty or damaged, it must be replaced. When PCM senses low idle speed or wide open throttle through TP sensor, PCM will de-energize A/C clutch relay, preventing A/C operation. PCM also de-energizes relay if engine coolant temperature is more than 257°F (125°C).

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