Blower Controls - Troubleshooting Procedures

COMPLAINT VERIFICATION
Go to "Functional Check of the Heating and Air Conditioning System" for a guide to normal operation. System Check of the Heating and Air Conditioning System

TROUBLESHOOTING
Perform the following checks before doing the System Diagnosis.
1. Check Fuse 20 by visual inspection.
2. If Blower will run in high only, check the Blower Resistors' Safety Switch for an open.

If OK:
Go to System Diagnosis for diagnostic tests.

SYSTEM DIAGNOSIS
Perform the following tests listed for your symptom in the Symptom Table below.





Symptom Table





Test A: Control Switch Voltage Test





Test B: Blower Speed Control Test





Test C: Blower Motor Test