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Thread: blow motor fan only goes on high

  1. #1
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    blow motor fan only goes on high

    My marauder's blower motor only goes on high... is that the resistor mounted on the firewall which replaced twice already?

  2. #2
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    Most likely. Mine was doing the same; replaced it 2 months ago.

  3. #3
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    Thanks.. i replaced it out 2 years ago with a Ford part too... geez....

  4. #4
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    I can repair yours. PM me.
    “When you can’t make them see the light, make them feel the heat.”
    Ronald Regan

    "The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
    is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

    Lt. Colonel Ralph Peters

    “Be polite, be professional, but have a plan to kill everybody you meet.”
    "I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
    General James Mattis




  5. #5
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    I have a theory on why these burn out, but need to ask a question. Do you use Max AC with fan set to less than HI? I suspect the transistor is not getting cool outside air across it, per hvac diagrams, thus it is overheating. When normal AC is selected, outside air is flowing across the transistor.
    ______________________________ _______________
    2003 BLACK 300A 06/19/2002 Build 1665 of 7839


  6. #6
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    I've heard that the failure is caused by poor quality solder being used at the solder points...

  7. #7
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    Mine was Solder joints, resoldered with better solder and lasted until I sold the vehicle. That is the repair that Jim uses most of the time.
    Bill
    03 Mercury Marauder, 300A
    SOLD
    2005 Lincoln Town Car, ADTR Supercharger, TCE Brake Lines, MO's Tune
    2020 Lincoln Aviator Reserve

  8. #8
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    Quote Originally Posted by Black Terror View Post
    Mine was Solder joints, resoldered with better solder and lasted until I sold the vehicle. That is the repair that Jim uses most of the time.
    I use solder containing lead. The solder used in OEM units has to be RoHS certified which means it has no lead in it. Lead is what makes the joints flexible and not prone to crack or fail. I also add a copper wire at a certain connection.
    “When you can’t make them see the light, make them feel the heat.”
    Ronald Regan

    "The only way to deal with the Islamic State - these blood thirsty, blood-drunken, terrorists -
    is to kill them, keep on killing them, until you kill the last one, then you kill his pet goat."

    Lt. Colonel Ralph Peters

    “Be polite, be professional, but have a plan to kill everybody you meet.”
    "I come in peace. I didn't bring artillery. But I'm pleading with you, with tears in my eyes, if you **** with me, I'll kill you all"
    General James Mattis




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