Expedition, Navigator 2006-2007
Air Conditioning System Diagnosis
Verify the customer's concern by operating the climate control system to duplicate the condition.
Visually inspect the following:
Loose, missing or damaged A/C compressor drive belt
Loose or disconnected A/C clutch
Broken or binding door/actuator
Broken or leaking refrigerant lines
Obstructed in-vehicle temperature sensor
Disconnected in-vehicle temperature aspirator hose
A/C compressor inoperative
Blower motor inoperative
Cooling fan inoperative
Disconnected electrical connectors
If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
Make sure to use the latest scan tool software release.
Some PCM DTCs may inhibit air conditioning (A/C) operation. If any PCM DTCs are retrieved, diagnose those first.