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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1560 (Climate Control System - General Information (Except Electric) (1 Of2)) >> Description And Operation >> Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC) - System Operation and Component Description >> Component Description >> Ambient Air Temperature Sensor

Ambient Air Temperature Sensor

WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.

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. The Ambient Air Temperature (AAT) sensor is an input to the PCM through separate input and return circuits. If the outside air temperature is below approximately 0°C (32°F), the PCM does not allow the A/C clutch to engage.

After replacing an Ambient Air Temperature (AAT) sensor, the sensor data must be reset by either driving the vehicle at speeds consistently about 20 MPH for at least 5 minutes to update the filtered data or perform the multiple button press reset procedure to update to the current raw value.

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