How do I stop the hot air flow coming from drivers side when I roll down windows?

Asked by James Oct 16, 2015 at 12:40 AM about the 1998 GMC Sierra 1500

Question type: Maintenance & Repair

I replaced both actuators and heater and air conditioner both work fine and all my controls seem to be working correctly.  Except when I have the climate control off and roll down the windows hot air is blowing into the cab from under the dash/steering wheel

1 Answer
30,915

Tom answered 9 years ago

It;s probably the rotary selector switch .. they use both vacuum and electricity to select mixers ... The "O" rings get hard or expand and it blocks the orifices

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