blower moto/rfan switch

Discussion in 'Kenworth Forum' started by bluej, Jul 14, 2014.

  1. Highway Hypnosis

    Highway Hypnosis Light Load Member

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    Apr 12, 2014
    Minot, ND
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    So.. what was the diagnosis?
     
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  3. SaskBill

    SaskBill Bobtail Member

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    Aug 17, 2014
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    Hi, I have a 9900i and the cad blower motor only works on high :(, any help appreciated. Thanks Bill
     
    Highway Hypnosis Thanks this.
  4. Highway Hypnosis

    Highway Hypnosis Light Load Member

    144
    135
    Apr 12, 2014
    Minot, ND
    0
    classic textbook problem... 100% chance it's a bad resister block.

    remove and replace.

    a high-tech & overly complicated/involved explanation of the blower motor circuit is available upon request.
     
  5. SaskBill

    SaskBill Bobtail Member

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    Aug 17, 2014
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    Thanks I will try that :)
     
    Highway Hypnosis Thanks this.
  6. Highway Hypnosis

    Highway Hypnosis Light Load Member

    144
    135
    Apr 12, 2014
    Minot, ND
    0
    I see that you have chosen to forgo the high-tech & overly complicated/involved explanation of the blower motor circuit.

    smart man.
     
  7. SaskBill

    SaskBill Bobtail Member

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    2
    Aug 17, 2014
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    Have a couple more dumb ?'s, the actuator in the box does not move on any setting? Also the bi level does not come on on dash? Most be a louver under the dash as well? Is there also a fan under the dash? Also am going to take the dash apart & don't want to short anything out, is it ok to unhook the batteries? Thanks Bill
     
  8. SaskBill

    SaskBill Bobtail Member

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    Aug 17, 2014
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    :) no, I think I will pass up on anything complicated & take your word for it :)
     
  9. Highway Hypnosis

    Highway Hypnosis Light Load Member

    144
    135
    Apr 12, 2014
    Minot, ND
    0
    I am not familiar with truck HVAC other than a/c component repair; I am unfamiliar with HVAC design and therefore cannot offer a solution.

    Just a shot in the dark though.. it's possible your HVAC assembly actuators could be vacuum operated in which case I would look for a vacuum leak.

    In the automotive world, on post 1995 vehicles I could hook up a scan tool with bi-directional communication and command the various blend doors to actuate. If no response, replace actuator.

    Need a truck mechanic to help you out on this.
     
  10. SaskBill

    SaskBill Bobtail Member

    5
    2
    Aug 17, 2014
    0
    Ok, thanks, will keep trying, now I got into the dash & find it cracked around the valves, pretty flimsy dash :(
     
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