Troubleshooting Hints

Perform before beginning System Diagnosis
Check that Heater-A/C Selector Switch and Temperature Control Lever on the heater and A/C Control Assembly move freely.
- Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be checked by monitoring for a voltage drop with the system operational (under load).
- Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems refer to Diagnostic Aids. Diagnostic Aids
- Refer to System Diagnosis. Testing and Inspection