Overactive blower
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500, 472, 425, 368 Discussion, Overactive blower in Cadillac Engine Technical Discussion; Hi All, I'm the proud (relatively) new owner of a 68 Sedan DeVille - had it a couple months and ...
  1. #1
    SandShifter is offline Cadillac Owners Member
    Automobile(s): 68 Sedan DeVille
    Join Date
    May 2009
    Posts
    3

    Overactive blower

    Hi All,

    I'm the proud (relatively) new owner of a 68 Sedan DeVille - had it a couple months and love the thing so far - great car. Been reading a bunch in this forum - an incredible amount of knowledge in here.

    As of a couple weeks ago, I seem to now have a blower motor on my hands that never wants to quit. Whenever I take the car out, come back, park it and turn the key off - the blower won't stop no matter what I do (I've actually taken to disconnecting the battery's negative feed to stop it entirely so it stops draining.

    I *believe* the culprit is a faulty blower relay from the reading I've been doing (shop manuals are awesome!) but am not 100% sure, as I'm a newbie and not sure I have the electrical diagram completely understood.

    Anyone run into this before or have any thoughts?

    Thanks much!

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  3. #2
    BRUCE ROE is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado
    Join Date
    Jun 2009
    Posts
    216

    Re: Overactive blower

    Its either the relay, or the coil wire is always powered. Bruce Roe CLC # 14630

  4. #3
    cadillac_al is offline Cadillac Owners Connoisseur
    Automobile(s): Cadillac 78 Seville, 78 Coupe de Ville, 92 Sedan de Ville
    Join Date
    Feb 2007
    Location
    Maine
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    53
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    2,721

    Re: Overactive blower

    It sounds like the relay. I don't know where it is located though; it's usually close by in that general area. It might be easier to unplug the blower until you figure it out instead of removing the battery terminal.

  5. #4
    steelybill is offline Cadillac Owners Enthusiast
    Automobile(s): '85 Fleetwood FWD
    Join Date
    Mar 2009
    Location
    mich
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    82
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    727

    Re: Overactive blower

    It's kind of curious as to how the blower gets power with the ignition off. The later Caddys have a residual-power relay, which keeps power on for some things like the radio, power windows etc, with the ignition off, until a door is opened. Don't know about an older one like yours.
    You need a manual with electrical schematics in it. Try Ebay for a factory manual. It will pay for itself very quickly.

  6. #5
    drmenard is offline Cadillac Owners Enthusiast
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003
    Location
    Massachusetts
    Posts
    980

    Re: Overactive blower

    I have seen a alternator diode short out and back feed power and keep things like the blower on...try taking off the wires to the alt. and see if the blower stops..

  7. #6
    SandShifter is offline Cadillac Owners Member
    Automobile(s): 68 Sedan DeVille
    Join Date
    May 2009
    Posts
    3

    Re: Overactive blower

    Thanks for the thoughts on this, everyone. I have made the upgrade on "which end of the wire I'm unhooking" as the immediate work-around

    I do have a shop manual, but my comprehension of the electrical schematic is the weak point...... The previous owner had pretty much every wire in the engine wrapped in a ton of electrical tape, making deciphering the wires kind of a mess, so I'm going to avoid jumping into that if possible, but sounds like the relay is at least a reasonable guess here......I'll check into a replacement if it's not too expensive. The relay is attached to the back of the dashboard by a screw or two, so it's not looking like a tough replacement procedure.

    Absolute worst case scenario - I've not used the climate control to this point anyways, so may just live without - my primary concern is it draining the battery after ignition shutdown.

    Thanks!

  8. #7
    BRUCE ROE is offline Cadillac Owners Fanatic
    Automobile(s): Eldorado
    Join Date
    Jun 2009
    Posts
    216

    Re: Overactive blower

    Oh, you have CLIMATE CONTROL. I don't have a 69 Cad manual, but my 79 CC blower control is quite different from my other non CC cars. You really must get a manual to deal with this system. Bruce Roe CLC # 14630

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