How to clear STOP ENGINE and ENGINE OVERHEATED messages
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Cadillac Seville / Cadillac Eldorado Forum Discussion, How to clear STOP ENGINE and ENGINE OVERHEATED messages in Past Cadillac Vehicle Discussion; I have a 1992 Eldorado that overheated a few days ago. All back to normal now except that I cannot ...
  1. #1
    kclanahan is offline Cadillac Owners Member
    Automobile(s): 1992 Eldorado
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    How to clear STOP ENGINE and ENGINE OVERHEATED messages

    I have a 1992 Eldorado that overheated a few days ago. All back to normal now except that I cannot clear the messages STOP ENGINE and ENGINE OVERHEATED from the dash display. This is annoying because they stay on for a really long time and prevent me from seeing the actual coolant temp display (or any other of the sensor displays).

    I have gone into the diagnostics mode and cleared all codes (ECM, IPC, ACP, SIR) and I have disconnected the battery to attempt a reset. Neither had any effect on clearing these messages.

    Any suggestions?

    thanks!

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  3. #2
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Bad coolant temp sensor?

    They won't go away cuz the car is still recognizing a problem. It believes its still overheating.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: How to clear STOP ENGINE and ENGINE OVERHEATED messages

    Now there's a thought ^^^^


    Might try pulling both battery cables and touch them together.

  5. #4
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    Those messages display when the coolant temperature is currently too high. What is your temperature readout?

  6. #5
    kclanahan is offline Cadillac Owners Member
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    Re: How to clear STOP ENGINE and ENGINE OVERHEATED messages

    1BadCadSTS , good tip. I'll see if I can find and test the sensor.

    Ranger,
    I'll give that a shot. What's the theory behind that?

    MoistCabbage,
    It's running in the range of 190 to 215 but it seems as though once the code was set it doesn't go away. Or as 1BadCadSTS suggests maybe there's a bad sensor making it think it's overheated.

    Thanks all for the quick responses.

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    If the sensor was bad, the displayed temperature would be higher, in the overheated range.

    ----------

    Actually, now that I think of it, how many temp sensors does the 4.9 have? Separate for gauge and PCM?

  8. #7
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
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    Re: How to clear STOP ENGINE and ENGINE OVERHEATED messages

    ^ There is a coolant temp sensor near the EGR and an engine metal temp switch on rear on left cyl head.
    Not sure if it's "on/off", variable, normally open or normally closed, but you can try unplugging it first.

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: How to clear STOP ENGINE and ENGINE OVERHEATED messages

    Quote Originally Posted by kclanahan View Post
    Ranger,
    I'll give that a shot. What's the theory behind that?
    I think it discharges all the capacitors. It's kind of like a reboot. Probably won't help, but can't hurt.

  10. #9
    Zynder is offline Cadillac Owners Member
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    Re: How to clear STOP ENGINE and ENGINE OVERHEATED messages

    The head temperature switch must be plugged in to clear the message. My connector on mine broke off somehow and it screamed about it overheating when it actually wasn't. It's on the back of the head facing the firewall in the area where the blower fan is. Hope you have little hands.

  11. #10
    drewsdeville's Avatar
    drewsdeville is offline Cadillac Owners Master
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    Re: How to clear STOP ENGINE and ENGINE OVERHEATED messages

    Simply jump the connector prongs with a piece of wire, paper clip, or some other conductor to temporarily eliminate the temp switch. The light should go out - if it does, and the coolant temp is in range, the switch is bad.

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