F 450 2WD Super Duty V10-6.8L VIN V (2005)
Evaporator Temperature Sensor / Switch: Description and Operation
AIR CONDITIONING EVAPORATOR TEMPERATURE (ACET) SENSOR
A/C Evaporator Temperature (ACET) Sensor Voltage And Resistance Chart (Part 1)
A/C Evaporator Temperature (ACET) Sensor Voltage And Resistance Chart (Part 2)
The ACET sensor measures the evaporator air discharge temperature. The ACET sensor is a thermistor device in which resistance changes with
temperature. The electrical resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases.
The PCM sources a low current 5 volts on the ACET circuit. With SIG RTN also connected to the ACET sensor, the varying resistance affects the
voltage drop across the sensor terminals. As A/C evaporator air temperature changes, the varying resistance of the ACET sensor changes the voltage the
PCM detects.
The ACET sensor is used to more accurately control A/C clutch cycling, improving defrost (demist performance, reduce A/C clutch cycling, etc.