Preliminary Inspection
WARNING: This page is about a different car, the 1999 Lincoln Navigator and 1999 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- Verify customer complaints by operating system in all available modes. Carefully check the following for possible cause of problems and repair as necessary: damaged vacuum hoses, system components, damaged compressor drive belt, open fuses, damaged/misrouted wiring circuits, and damaged/disconnected connectors.
- Check for small leaks in vacuum circuit. Test vehicle with engine running and accelerate engine while checking airflow. During acceleration, all airflow will suddenly go to defrost outlets, indicating a small leak.
- While checking vacuum hoses, DO NOT pinch hoses to stop vacuum flow. Instead, plug hoses with wooden golf tee for testing. Vacuum hose material will not withstand pinching.
- If inspection reveals a problem, service as necessary and repeat preliminary inspection. If problem remains after preliminary inspection, connect New Generation Star (NGS) Tester (007-00500), or scan tool, to Data Link Connector (DLC), located beneath instrument panel. Perform DATA LINK DIAGNOSTICS test.
- If NGS responds with NO RESPONSE/NOT EQUIPPED for EATC module, go to TEST A . If DATA LINK DIAGNOSTICS test is passed for EATC module, retrieve stored DTCs and perform EATC self-diagnostics. See ENTERING SELF-DIAGNOSTICS under SELF-DIAGNOSTICS.
- If any DTCs are retrieved, go to SELF-DIAGNOSTIC TEST CODE DIRECTORY table to continue diagnostics. If EATC module cannot be accessed by NGS, go to TEST A .