With HVAC System - Manual

1. Check for vacuum to the Heater-A/C Control.
2. Check the HVAC CTL and DIC/HVAC Fuses in the fuse block for an open.
3. Make sure G200 is clean and tight.
4. Move the Temperature Control to full "COLD" and then full "HOT." Listen for the sound of the Electric Actuator moving the valve through its full range.
- 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 General Troubleshooting Procedures). Diagnostic Aids
- Refer to System Diagnosis.