Service Procedure: Overview

If no Diagnostic Trouble Codes (DTCs) are obtained during the EATC/DATC module self-test, refer to the following diagnostic Service Procedure.

1. Inspect the in-car temperature sensor aspirator hose for proper connections at both ends.

2. Inspect the aspirator hose for kinks or cuts.

3. On applicable vehicles, verify that the in-car temperature sensor is attached and firmly seated to the dash panel. Some vehicles mount the sensor on two pins located on the dash panel. The sensor may be mounted onto the pins loosely and not seated firmly against the dash panel, causing a gap in the sensor-to-dash panel seal and allowing warm air from behind the instrument panel to be drawn across the sensor.

4. Explorer/Mountaineer Only: Check the mounting fasteners to verify that the gap in the fastener is facing horizontally (i.e., at 3 or 9 o'clock). If the gap in the fastener is facing vertically (i.e., 6 or 12 o'clock), the sensor will require greater pressure to seat firmly against the instrument panel.

NOTE:
A LOOSELY MOUNTED IN-CAR TEMPERATURE SENSOR, OR ASPIRATOR HOSE WITH CUTS OR KINKS MAY CAUSE SYSTEM TO BE UNABLE TO MAINTAIN SETPOINT TEMPERATURE OR SETPOINT IS REACHED BUT SYSTEM GRADUALLY COOLS.