1971 cadillac cruise control
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The Classic Cadillac Forum Discussion, 1971 cadillac cruise control in Past Cadillac Vehicle Discussion; Hello everyone, A question for you all. My 1971 DeVille has cruise control that isn't functioning. When I turn on ...
  1. #1
    ZeldaOoT is offline Cadillac Owners Member
    Automobile(s): 1971 Cadillac Sedan Deville
    Join Date
    Aug 2012
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    1971 cadillac cruise control

    Hello everyone,

    A question for you all. My 1971 DeVille has cruise control that isn't functioning. When I turn on the cruise switch, it does light up "on" in green, however, when I push the button to engage it on the turn signals nothing happens. Anyone have any ideas what the issue may be given this info?

    Thanks,
    -ZeldaOoT

    ----------

    Allow me to add- I doubled checked that my tubes hold vacuum pressure and they do. I think the issue is that the wire connected saying "engage" is only attached by a thread. Could that be the issue even though it is still attached, although only by one wire? I feel it is but had one person tell me it wouldn't be. I just want another opinion.

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  3. #2
    77CDV's Avatar
    77CDV is offline Cadillac Owners Master
    Automobile(s): 77 CDV, 06 DTS III, 69 FWB
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    Re: 1971 cadillac cruise control

    If all the vacuum is hooked up right, and the bead chain that connects the servo to the throttle is hooked up, then the servo is bad.

  4. #3
    ZeldaOoT is offline Cadillac Owners Member
    Automobile(s): 1971 Cadillac Sedan Deville
    Join Date
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    Do you still think that given the wiring issue I mentioned?

  5. #4
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
    Automobile(s): 1970 Eldorado.
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    Re: 1971 cadillac cruise control

    The coil spring inside the cruise control unit is probably broken. It is a mechanical cruise control that works with springs, vacuum and contacts. I have the same thing. I tried to replace the coil spring a long time ago, but had no success. I will check out a remanufactured one from cardone. They offer them through ebay as well.

    I just haven't found the real need for it to spend the money...

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