Heating Symptom Troubleshooting

Symptom Diagnostic procedure Also check for 
Recirculation control doors do not change between Fresh and Recirculate Recirculation Control Motor Circuit Troubleshooting 
  • Blown fuse No. 14 (10A) in the under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
 
Both heater and A/C do not work Heater Control Power and Ground Circuits Troubleshooting 
  • Blown fuse No. 14 (10A) in the under-dash fuse/relay box
  • Poor ground at G501
  • Cleanliness and tightness of all connectors