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Home >> Ford >> 2014 >> Fiesta ST >> Repair and Diagnosis >> External Pages >> Different car >> Section 233 (Climate Control System - General Information) >> Description And Operation >> Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description >> Ambient Air Temperature Sensor
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Ambient Air Temperature Sensor

WARNING: This page is about a different car, the 2015 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.

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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