Overheating question - 1999 Deville
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Overheating question - 1999 Deville in Past Cadillac Vehicle Discussion; Hi guys, After changing thermostat 25$, water pump 500$, water crossover gasket and egr tube 933$, pressure tested at 40 ...
  1. #1
    franky de longueuil is offline Cadillac Owners Member
    Automobile(s): 1999 Cadillac Deville
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    Angry Overheating question - 1999 Deville

    Hi guys,

    After changing thermostat 25$,
    water pump 500$, water crossover gasket and egr tube 933$, pressure tested at 40 lbs. block tested 40$ and UV tested 6$,
    the car still loosing coolant but runs stable at 197 degrees at idle, but still overheat on the highway.
    on the highway it will reach 230 degrees and the fans will do their work and bring the heat down to about 201, but when the heat rise again about 5 minutes later it does not stop until the ac off sign appears.

    So I stopped let the car cool down (20 minutes) and put 1 gallon of coolant, aa i notice boiling in the surge tank,
    and when I touch the radiator it is not warm at all
    but the coolant top steel tube connecting on the top of the radiator is very very hot.

    Question : How come the radiator is still cold when the coolant is at 255 degrees,
    And why is the coolant steel tube is so hot when it is so close to the rad. ?


    Thanks in advance, By the way I am surfing on the web for a rebuilt engine just in case of .....

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  3. #2
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: overheating question ?

    If you've replaced the thermostat, water pump, crossover gaskets, egr tube and ran all those tests and it's still overheating........

    Did you check the purge line? Make sure it flowing water and not clogged. Did you check your radiator for circulation? A little tricky but doable.

    The upper hose should be warm when the car is at operating temperature, now you have to feel if the lower radiator hose is warm also.

    When you turn on the heat, do you get cool air or warm air? Overheating at highway speeds?!

    Someone else tell him, please......


  4. #3
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: overheating question ?

    It looks like you're located in Canada, You can try contacting www.northstarperformance.com

  5. #4
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: overheating question ?

    the radiator you are feeling that is cold is probably the AC condenser -
    the actual radiator is behind it -

    like 98eldo said - check the purge line for coolant flow -

    if you have any additional work done on your car -
    find a different shop - the one that has done the above work -
    is ripping you off - big time -

    Someone else tell him, please......

    YEP - you have all the symptoms of the blown head gasket -

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: overheating question ?



    Why oh why do people throw parts at it and replace every cooling system component on the motor, hoping one sticks when it starts to overheat instead of diagnosing it properly

  7. #6
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: overheating question ?

    Because some people don't know to come here and ask questions first.

  8. #7
    franky de longueuil is offline Cadillac Owners Member
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    Re: overheating question ?

    I checked the purge line and it is working ok.
    Is it really the radiator(not the AC) that stay cold.

    I am clueless

    Thanks everyone for your kindly advise.

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: overheating question ?

    #1 is the radiator. #14 is the A/C condenser.


  10. #9
    franky de longueuil is offline Cadillac Owners Member
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    Re: overheating question ?

    Thanks for the picture Ranger,
    Like I said it is the Radiator.

    The radiator (who looks like new) does'nt get hot even when the coolant reach 250 degrees,
    by the way when I put the heat on, I got warm air.

  11. #10
    Ranger's Avatar
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    Re: overheating question ?

    Assuming that the replacement thermostat is good, the purge line is clear and your radiator is cold with ECT at 250 degrees it is safe to assume that you have no flow to the radiator. Check the WP belt tensioner. Check for a clogged radiator. Then do a block test.

  12. #11
    franky de longueuil is offline Cadillac Owners Member
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    Re: overheating question ?

    After changing thermostat 25$,
    water pump 500$, water crossover gasket and egr tube 933$, pressure tested at 40 lbs. block tested 40$ and UV tested 6$,
    the car still loosing coolant, but runs stable at 197 degrees at idle, but quickly overheat on the highway.
    The mechanics that do the work has worked 32 years on Cadillac. So he told me if you have a HG problem, I will replace it at no charge and refunds you for all other expenses.
    Fair deal..

    Back to the garage, they did a leak down test which show no pressure leak at all.
    Purge line is clear,
    Ac condenser and radiator pressure washed, a lot of shit came out. we tought we have found the problem.
    Then did a road test at 60 mph, and in 20 miles it overheated again. ( AC off- Idle engine)
    This car driving me nuts, and I have read many posts on this very usefull site, but I am still clueless, what should i do now.

    I have noticed that when the temp goes to 250+ the radiator is not hot, IS this normal ?
    I pulled the code : ACM B1350 history
    SPM U1255 history
    PZM B0533 history

    Any help will be appreciated.
    Thanks

  13. #12
    franky de longueuil is offline Cadillac Owners Member
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    Re: overheating question ?

    since the car is eating coolant like crazy, I put tap water unstead of coolant, until we found the problem
    $$$$

  14. #13
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by franky de longueuil
    After changing thermostat 25$,
    water pump 500$, water crossover gasket and egr tube 933$, pressure tested at 40 lbs. block tested 40$ and UV tested 6$,
    the car still loosing coolant, but runs stable at 197 degrees at idle, but quickly overheat on the highway.
    The mechanics that do the work has worked 32 years on Cadillac. So he told me if you have a HG problem, I will replace it at no charge and refunds you for all other expenses.
    Fair deal..

    Back to the garage, they did a leak down test which show no pressure leak at all.
    Purge line is clear,
    Ac condenser and radiator pressure washed, a lot of shit came out. we tought we have found the problem.
    Then did a road test at 60 mph, and in 20 miles it overheated again. ( AC off- Idle engine)
    This car driving me nuts, and I have read many posts on this very usefull site, but I am still clueless, what should i do now.

    I have noticed that when the temp goes to 250+ the radiator is not hot, IS this normal ?
    I pulled the code : ACM B1350 history
    SPM U1255 history
    PZM B0533 history

    Any help will be appreciated.
    Thanks
    Replacing the headgaskets free of charge? Thats funny. Is he going to stud the block too (since the head bolts pulling out is what causes the head gasket problem?)

    I'd say it is time to do a block test (you can do it yourself for under 10 dollars)

  15. #14
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: overheating question ?

    Quote Originally Posted by franky de longueuil View Post
    I have noticed that when the temp goes to 250+ the radiator is not hot, IS this normal ?
    Absolutely not. The radiator is not doing it's job.

  16. #15
    franky de longueuil is offline Cadillac Owners Member
    Automobile(s): 1999 Cadillac Deville
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    Re: overheating question ?

    Yes I already did the block test and it was negative.

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