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Home >> Ford >> 2016 >> Fiesta S, 4D Hatchback, Standard Trans >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Climate Control System - General Information >> Description And Operation >> Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description >> Component Description >> Ambient Air Temperature Sensor
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Ambient Air Temperature Sensor

The Ambient Air Temperature (AAT) sensor is an input to the IPC and is relayed to the PCM over the HS-CAN. The Ambient Air Temperature (AAT) sensor contains a thermistor. The sensor varies its resistance with the temperature. As the temperature rises, the resistance falls. As the temperature falls, the resistance rises. If the temperature is below a predetermined value, the PCM does not allow the A/C compressor clutch to engage.

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