Question about 2003 Chevrolet Blazer

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The heater control does not change the air flow to any one position, all vents seem to be open at one time.All the fans ,air & heat work, but the air flows from all vents on this 2003 s10 pickup.

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Check any vacuum hoses from engine all the way to heater/a/c housing under dash,for leaks. Then manually move or put a vacuum guage on every vac motor you can see and get to. Your working your way back to the switch. If you want to you could start at the switch but % wise and degree of difficult your better to back in. Now a schematic will make the process easier. Hard to work on a system you don't know .Electrical or Computer sometimes play into these, I have an older S10 so no computer.

Posted on Sep 29, 2009

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