Question about 1999 Chevrolet Suburban

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1996 GMC Suburban heater blows on floor

It doesn't matter if I adjust the knob to the floor, vent or defrost. It keeps blowing all the hot air out the floor vent. Can I manually or bypass the electrical portion to blow the air out the defrost?

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  • yadayada
    yadayada May 11, 2010

    check themode control switch for vacuum.

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  • 15 Answers

Yes those controls are vacuum controlle. Could be as simple as a bad hose or connection.

Posted on Feb 19, 2009

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1 Answer

Have 97 gmc suburban. Heat blows out vents an floor when I switch to defrost it jus stays on vents. Passanger side will defrost verry slow. Half of driver side will not defrost. What could b issue?


Dear Aaron,
Your heater and air conditioner assemblies are partly vacuum actuated.
The parts underneath the dash are also largely plastic.
Many, if not most of the time, either there is a vacuum leak ( that you
probably cannot hear) or a plastic part that is sticking or has broken. Those parts like that are usually inside the housing & ductwork under the dashboard on the right side also under the glove box.
God bless your efforts.

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