Heater Resistor
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, Heater Resistor in Past Cadillac Vehicle Discussion; Hey does anyone know where to find the Blower motor resister for my 1987 cadillac brougham (307 v8) ?? If ...
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    CaddylacBrougham's Avatar
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    Heater Resistor

    Hey does anyone know where to find the Blower motor resister for my 1987 cadillac brougham (307 v8) ?? If you could help I would be very thankful because its becoming annoying without heat in the cold I can't find it in the manual for my car

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    Spock's Avatar
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    Re: Heater Resistor

    I believe it is on the passenger side in the car, just above where their feet would be.
    Take off that plastic shield and it should be there.

    Right now I'm trying to get my heater going as well still, I was first under the impression that it's outside of the car and now I believe it to be on the inside. Have done quite a bit of reading in the past forums here but still can't find it...
    I simply don't know what it looks like lol. I check all the wire leads and *assume* its some parts.

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    Re: Heater Resistor

    It's out under the hood. Located on top of the A/C box, it has a large black ground wire going to it, as well as, an 6-wire electrical connector from the harness. Also, it is called a "power module." These go bad a lot. Maybe someone has a picture they'll post.

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    FASSTWOOD's Avatar
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    Re: Heater Resistor

    Here you go...

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    Re: Heater Resistor

    Hey thank you very much for the pic and the info I will soon be on my way to heat

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    Re: Heater Resistor

    Hmmm does anyone know what to test on it to see if it works? like what prongs to test with the ohm meter etc.?

  8. #7
    FASSTWOOD's Avatar
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    Re: Heater Resistor

    Quote Originally Posted by CaddylacBrougham
    Hmmm does anyone know what to test on it to see if it works? like what prongs to test with the ohm meter etc.?
    Its held in by two screws, just pull them out and look at the coils. You will be able to tell if the coils are broken.

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    Re: Heater Resistor

    Ok I took it out and the coils don't look broken. If that is a common part to break then they are pretty expesive the local advanced auto wants 167.77 for that stupid thing. What else could be making the blower motor stay on when the car is off?

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    FASSTWOOD's Avatar
    FASSTWOOD is offline Cadillac Owners Enthusiast
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    Re: Heater Resistor

    I had a similar problem also. but once i opened the hood it would turn off. It turned out to be the wrong blower i the car and the flange of the blower would ground itself against the hood spring in the hinge when i closed the hood. the positve is constant in my car and the ground regulates the speed.

    hope this helps...

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    Re: Heater Resistor

    What do you mean by wrong blower? hmmmm thinks cause the power module looks good to be in good condition.

  12. #11
    FASSTWOOD's Avatar
    FASSTWOOD is offline Cadillac Owners Enthusiast
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    Re: Heater Resistor

    The guy that owned the car before me swapped out the original blowerfor one that he probably had laying around or picked up froma junk yard. The flange that bolts to the heater box had a different shape to it and was grounding out against the hood spring.

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