Overheating 95 Seville Sls
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Northstar Engines and System Technical Discussion Discussion, Overheating 95 Seville Sls in Cadillac Engine Technical Discussion; New Radiator, Thermostat, Coolant At 50/50 Mix, Fans Are Operating Properly But My Vehicle Overheats. When Info Button Is Pushed ...
  1. #1
    BIGMAN-7 is offline Cadillac Owners Member
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    Question Overheating 95 Seville Sls

    New Radiator, Thermostat, Coolant At 50/50 Mix, Fans Are Operating Properly But My Vehicle Overheats. When Info Button Is Pushed No Info Displayed. Obd Works Fine But Information Won't Display When Button Is Pushed. The Car Is Overheating And The Displays Says ...a/c Compressor Off... Idle Engine.... Engine Overheat...... It Has 135k

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  3. #2
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    Check the water pump belt tensioner and make sure the purge line is clear and flows coolant. If all is ok, do a cylinder pressure test.

  4. #3
    BIGMAN-7 is offline Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    WATER PUMP BELT TENSIONER OK, PURGE LINE CLEAR, NO LEAKAGE IN COMPRESSION TEST.....??????????

  5. #4
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    Hmm, not using any coolant? No bubbles in the surge tank when started cold with the cap off? Perhaps a faulty tempurature sensor.

  6. #5
    BIGMAN-7 is offline Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    Thanks for the input......... drained and replaced coolant with dex cool....... problem solved!!!!

  7. #6
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Overheating 95 Seville Sls

    Does it lose coolant?

    Ranger suggested a cylinder pressure test, not a compression test.

    Have a combustion byproduct test done. Radiator shops usually do them inexpensively.


    There's a large chance the headgaskets are leaking.

  8. #7
    BIGMAN-7 is offline Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    Mistake on test noted but so far the vehicle hasn't run hot since replacing coolant with dex cool...... it would normall run hot after 30 mins of normal driving...... no problems with my daughter driving it all day. I will have the cylinder test done for reassurance..... thanks.

  9. #8
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Overheating 95 Seville Sls

    You should have the combustion byproduct test done after the coolant is in there awhile. Like I said, radiator shops do them much cheaper than mechanics.

  10. #9
    BIGMAN-7 is offline Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    If headgaskets are leaking....... what then?

  11. #10
    BIGMAN-7 is offline Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    another question..... what can be the cause of no information displayed when the info button is pushed? "change engine oil" can not be reset and nothing can be monitored...( coolant temp.... voltage) car flashes "system" and "change engine oil" while driving...... computer maybe? if so, where is it's location if it nedds to be replaced.... my daughter loves the car.....

  12. #11
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Overheating 95 Seville Sls

    Fix it,
    sell it "as is",
    junk it
    Only choices I can think of.

  13. #12
    Jonny5 is offline Cadillac Owners Fanatic
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    Re: Overheating 95 Seville Sls

    to fix, a faulty head gasket will cost about 2 grand or more. Then a new computer is another grand or so....... Get a new car

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