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2002 Oldsmobile Alero Question: why won't blower fan blow out defrosters ?

 

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Bryan Stout, Saint Cloud, MN, November 14, 2013, 20:34
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all fan speeds work but won't switch from floor to defroster outlets.

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  • Answer #1

    goodguy November 14, 2013, 20:40
     Master

    check your blend door actuator

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  • Answer #2

    csubak30 November 14, 2013, 22:31
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     Master

    If this vehicle has a vacuum harness to the vent control system, follow the line through the firewall to the vacuum pump and make sure there are no breaks in the line. You will know from past experience if it was a vacuum setup by when you adjusted the direction you probably heard an 'air slurp' as you switched from floor to defrost etc.

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  • Answer #3

    cardocIII from Gillespie's Auto Service, November 15, 2013, 01:51
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     Master

    When you select defrost vacuum should be applied to the blue vacuum line which pushes the defrost door open and the heater door closed, and the red vacuum line which closes off the dash vents.

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  • Medium-star Best Answer
    Greg's Orange Auto (12205 Answers) , Orange, CA - (714) 361-9386
    globalhelper November 15, 2013, 06:07
     Master

    agree with #1

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  • Answer #5

    G. T. Service Center (3102 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG November 15, 2013, 06:59
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     Master

    The defrost door is operated by the Red & Yellow vacuum lines, Per 'Mitchell'. The Blue & Green operate the Mode door which closes the vents. Don't agree with blend door, unless you have a heating issue.

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