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    My 1999 ford F 250 super Duty heat or ac will not blow out the vents. It is like all the vents are closed off

    I have replaced the switch.

    0  Views: 541 Answers: 3 Posted: 11 years ago
    Tags: heat and ac

    3 Answers

    Check here


    http://www.ford-trucks.com/forums/1200663-cannot-figure-out-face-vents-or-heat.html

    check switch by bypassing  it.  there is a blend door in heater that selects heat or cooling. check to see if it's has not stuck shut.  The heater & AC gets it air from a grill right in front of hood or at bottom of windshield out side. It will be very simple when U find problem.

    Maybe thier collapsing



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