heat wont blow out the defroster

Discussion in 'Trucks [ Eighteen Wheelers ]' started by jjtrucking, Nov 29, 2013.

  1. jjtrucking

    jjtrucking Bobtail Member

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    Jul 30, 2012
    0
    I have a 97 w900 the heat will blow on the floor are out the vents in the dash but it wont blow out the defrosters when you move the lever to blow out the defroster it still blow out the vent in the dash
     
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  3. GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    Could be a flapper motor (or air cylinder) or flapper broken or stuck. If it's an air dash, do you hear any leaks when on defrost?
     
  4. jjtrucking

    jjtrucking Bobtail Member

    27
    0
    Jul 30, 2012
    0
    I found One I think that for the vent it in front of the passenger
    seat
     
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