Stop Engine temp light
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  • 1 Post By Aztec ETC ECS
Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Stop Engine temp light in Past Cadillac Vehicle Discussion; 1993 Deville - stop engine temp light stays on while cruising, but flashes off when accelerating or braking.... have flushed ...
  1. #1
    Russelllyn is offline Cadillac Owners Member
    Automobile(s): Deville
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    Stop Engine temp light

    1993 Deville - stop engine temp light stays on while cruising, but flashes off when accelerating or braking.... have flushed coolant system, changed thermostat and repaired head gasket leak with Steel Seal . heat and air no longer work. desperate to keep this going until next June... only 155K miles.... inherited from parents.
    can you tell me what else I can possible try?

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  3. #2
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
    Automobile(s): '02 ETC ECS#533, '05 Escalade, '05 AWD Magnum, '74 455 OLDS
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    Re: Stop Engine temp light

    Brace yourself for a serious hammering.
    basscatt likes this.

  4. #3
    brougham is offline Cadillac Owners Master
    Automobile(s): 1991 Cadillac Brougham D'Elegance 5.7 Litre
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    Re: Stop Engine temp light

    First make sure it's really overheating. Does the cooling system leak? Is the rad cap good? Is the thermostat the right one? If it has a bad headgasket you'll be wasting money at the overheating problem for nothing. Get that fixed before doing anything else. Continuing to drive can only make things worse.

  5. #4
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
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    Re: Stop Engine temp light

    Quote Originally Posted by Russelllyn View Post
    1993 Deville - stop engine temp light stays on while cruising, but flashes off when accelerating or braking.... have flushed coolant system, changed thermostat and repaired head gasket leak with Steel Seal . heat and air no longer work. desperate to keep this going until next June... only 155K miles.... inherited from parents.
    can you tell me what else I can possible try?
    --------------------------------
    repaired head gasket leak with Steel Seal
    you DID NOT repair anything with that - shi - ah - stuff -
    in fact - you probably caused more problems with it -

    heat and air no longer work

    OK - WHAT doesn't work -
    the blower doesn't blow? -
    WHAT?
    ---------------
    desperate to keep this going until next June
    throwing parts at it - and dumping SNAKE-OIL in it -
    is NOT going to FIX anything -

    you need to properly DIAGNOSE the problem -
    THEN you can REPAIR it -

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: Stop Engine temp light



    A 4.9 with bad HG's? That's not very common.

  7. #6
    Aztec ETC ECS's Avatar
    Aztec ETC ECS is offline Cadillac Owners Connoisseur
    Automobile(s): '02 ETC ECS#533, '05 Escalade, '05 AWD Magnum, '74 455 OLDS
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    Re: Stop Engine temp light

    ^ And is a MUCH easier repair than an N*.

  8. #7
    limo1 is offline Cadillac Owners Member
    Automobile(s): 1985 Fleetwood 75
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    Re: Stop Engine temp light

    Sounds like the high temp switch screwed into the block drain hole if temp gets very high it closes and grounds the wire .
    as you are saying it only comes on during acceleration and braking it sounds like this sensor wire is touching ground somewhere and the flexing
    of the motor is breaking the grounded wire. find the wire to the sensor and make sure it is not shorting to ground.
    Last check the lamp test during the key start sequence is the ignition switch causing a short to ground flaky switch.

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