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A/C Evaporator Temperature Sensor Circuit

The refrigerant system incorporates an A/C compressor controlled by the Powertrain Control Module (PCM) through an A/C clutch relay. The climate control assembly sends an A/C request signal to the instrument cluster module, which relays the request to the PCM. An evaporator discharge air temperature sensor is used to disengage the A/C compressor clutch when the evaporator core temperature falls below an acceptable temperature.

The PCM sources a low current 5 volts on the A/C Evaporator Temperature (ACET) sensor circuit. As the A/C evaporator air temperature changes, the ACET circuit resistance changes (which changes the voltage the PCM detects).

Faulty Evaporator Temperature sensor
A/C evaporator temperature sensor harness is open or short
A/C evaporator temperature sensor circuit poor electrical connection

Check engine light
A/C Inoperative
A/C Blows Warm

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