Troubleshooting Hints - HVAC System - Manual

Perform before beginning System Diagnosis
1. If the Blower Motor does not operate, check the HTR-A/C Fuse by visual inspection.
2. If the Blower Motor does not operate, check that ground G1OO and G109 are clean and tight.
3. If the Blower Motor runs all of the time with the Ignition Switch in "OFF," replace the High Blower Relay.
4. If the Blower Motor runs with the Ignition Switch in "RUN" and the Mode Selector "OFF," replace the Mode Selector.
5. Replace the Mode Selector if the Blower Motor runs with the Ignition Switch in "RUN" and the Mode Selector in one but not all of the following modes: "VENT," "BI-LEV","HEAT," "DEFOG" and "DEF," "MAX" and "A/C."
^ Refer to System Diagnosis.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage check refer to Diagnostic Aids/General Troubleshooting Procedures. Diagnostic Aids
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems refer to Diagnostic Aids/General Troubleshooting Procedures. Diagnostic Aids