Heating Symptom Troubleshooting

Symptom Diagnostic procedure Also check for 
Blower motor runs, but one or more speeds are inoperative Blower Motor Circuit Troubleshooting Cleanliness and tightness of all connectors 
Blower motor does not run at all Blower Motor Circuit Troubleshooting 
  • Blown fuse No. 5 (40A) in the under-hood fuse/relay box, and No. 22 (7.5A) in the under-dash fuse/relay box
  • Poor ground at G402
  • Cleanliness and tightness of all connectors