Blower Motor Runs, But One Or More Speeds Are Inoperative (Without A/C)

Blower motor runs, but one or more speeds are inoperative

Diagnostic Procedure:

1. Probable cause: A problem in the circuits between the heater fan switch and the blower resistor

2. Do the blower motor circuit troubleshooting Blower Motor Circuit Troubleshooting

Also check for:

- Faulty blower resistor
- Faulty blower fan switch
- Poor or loose connections at the terminals