how do I replace heater control unit

Asked by groundlevel Jan 06, 2015 at 07:11 PM about the 2000 Buick Regal LSE Sedan FWD

Question type: Maintenance & Repair

fan switch only works on high and cant get defroster switch to operate

1 Answer
103,085

KenF answered 9 years ago

If the fan (blower motor) only works only in high it might be the blower motor resistor and not the switch. Air is directed to the defroster by one of the mode doors, if it's not working it might be a bad door actuator. You can access the blower motor wiring harness relatively easy through the glove box opening, and check for voltage when switching between the different fan speeds. You already know your fan is working.

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