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Thread: '85 Seville Climate Control Issues

  1. #1
    ProblemChildSeville is offline Cadillac Owners Member
    Automobile(s): 85 Seville
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    '85 Seville Climate Control Issues

    I have an '85 Seville that is experiencing issues. The current one is that the panels for climate control and MPG aren't coming on, and the defroster is stuck on full fan and heat.

    Controls for either are unresponsive. Also, the fuel gauge is apparently not working. Anyone have any experience with this unique issue?


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  3. #2
    carnut is offline Cadillac Owners Master
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    Re: '85 Seville Climate Control Issues

    Assuming this is a digital display cluster, its appears the climate control head is unplugged or faulty. Does this car have a non factory radio? No power thru the control head will default to hi fan and defroster operation. An incorrectly installed aftermarket radio can short out the control head. If the radio power is hooked up to the two wire radio display illumination wires in the factory radio harness, ( grey and orange 2 wire plug) it will kill the climate control head.

  4. #3
    ProblemChildSeville is offline Cadillac Owners Member
    Automobile(s): 85 Seville
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    Re: '85 Seville Climate Control Issues

    Factory radio, but it has seen a few sets of clumsy hands rummaging around in there. Good to know where to look. Thanks.

  5. #4
    carnut is offline Cadillac Owners Master
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    Re: '85 Seville Climate Control Issues

    So knowing that, I would suspect the dash climate control head or display. Easily removed, just 2 screws above the center A/C vents and the wood plate pops off. 2 more screws hold the climate head to the dash face. Remove those and gently pull the head out. With it still connected, start the car and wiggle the multi wire connector. If it displays, you might want to unplug the connector and clean the contacts with a pencil eraser. If that doesn't work then get another head. They're the same, Eldo or Seville 83 to 85. Only difference is some dont have a rear defogger button, most do. These are educated guesses on my part given the fact that I've owned 3 Eldos.

  6. #5
    ProblemChildSeville is offline Cadillac Owners Member
    Automobile(s): 85 Seville
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    Re: '85 Seville Climate Control Issues

    So I pulled the unit out, unplugged it, and replugged it. It works, until you cycle the ignition power, then it goes back to default. So does this mean the unit itself is faulty?

  7. #6
    carnut is offline Cadillac Owners Master
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    Re: '85 Seville Climate Control Issues

    Are you saying it displays and can be changed with the buttons in the RUN position, but if you start the car it blanks out?

  8. #7
    ProblemChildSeville is offline Cadillac Owners Member
    Automobile(s): 85 Seville
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    Re: '85 Seville Climate Control Issues

    No, if you start the car, it doesn't work. While the rig is running, if you unplug the module, then replug it, it will then work. If you then shut the car off and restart it again, it will not come on again.

    Also, it will work first thing in the morning, until it reaches about 80 degrees outside. Then it will stop coming on.

  9. #8
    carnut is offline Cadillac Owners Master
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    Re: '85 Seville Climate Control Issues

    I would get one from a self service wrecking yard. That's assuming you've cleaned the contact pins on the plug, looked at them closely for being bent or not fully seated in the connector. Did you clean the contacts on the control head as well?

  10. #9
    ProblemChildSeville is offline Cadillac Owners Member
    Automobile(s): 85 Seville
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    Re: '85 Seville Climate Control Issues

    The "new" climate control head has worked. Thanks for the information, guys. I'm sure I'll have more questions in the future.


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