2009 Chevy impala heater problem

Asked by GuruZWH6G Oct 18, 2017 at 09:19 PM about the 2009 Chevrolet Impala LS FWD

Question type: Maintenance & Repair

The heater iny car is bot working properly. The
passenger side blows hot but the driver side blowS
cold air

1 Answer
30,895

Tom answered 7 years ago

IMO the most likely causes are either a defective positioning switch or a bad mixer solenoid. I'm assuming that you have separate controls for driver and passenger ... if you do then the position switch has both electrical and vacuum functions ,,, in some areas the heat/cold over the years causes the position switch to fail ... That's easy compared to changing the vacuum positioner .. on some GM's you have to be very flexible to even see it ...(more than once I had to change the actuator by feel because I couldn't see it)

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