Blower Motor Runs, but One or More Speeds are Inoperative (Without A/C)

The blower motor runs, but one or more speeds are inoperative

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

Do the blower motor circuit troubleshooting Blower Motor Circuit Troubleshooting

Also check for

Faulty blower resistor

Also check for

Faulty blower fan switch

Also check for

Poor or loose connections at the terminals