Troubleshooting Hints - Temperature Controls

^ Check HTR A/C IGN Fuse if the air temperature does not change with the Temperature Selector.
^ Refer to HVAC System Check in Air Conditioning for a guide to normal operation.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause the system failure but prove GOOD in a continuity/voltage check (refer to General Troubleshooting Procedures).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of the other systems (refer to General Troubleshooting Procedures). Diagnostic Aids