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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; Thanks Ranger, I am glad to hear that, I will take the radiator off and have it cleaned by a ...
  1. #16
    franky de longueuil is offline Cadillac Owners Member
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    Re: overheating question ?

    Thanks Ranger,
    I am glad to hear that,
    I will take the radiator off and have it cleaned by a rad shop.
    Should I have the AC condenser check as well or just pressure washed?
    'cause it is in front of the radiator,
    and might be blocking the air cominging thru.

  2. #17
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: overheating question ?

    Quote Originally Posted by franky de longueuil View Post
    Thanks Ranger,
    I am glad to hear that,
    I will take the radiator off and have it cleaned by a rad shop.
    Should I have the AC condenser check as well or just pressure washed?
    'cause it is in front of the radiator,
    and might be blocking the air cominging thru.
    -------------------------------------------
    I think you misunderstood Ranger's reply -
    or possibly Ranger worded it wrong -

    your statement:
    I have noticed that when the temp goes to 250+
    the radiator is not hot, IS this normal ?


    Ranger's reply
    Absolutely not. The radiator is not doing it's job.

    IF the radiator is not hot when the engine overheats -
    you have a CIRCULATION problem -

    the hot coolant is NOT BEING PUMPED through the radiator -

    IF the radiator passages - INSIDE the radiator are blocked -
    coolant wont flow through it -

    IF the water pump isn't turning - coolant won't flow -

    IF the water pump impeller is somehow defective - coolant won't flow -

    IF the thermostat is defective or improperly installed - coolant won't flow -

    IF you have air pockets in the cooling system -
    and the purge line is not able to bleed the air out -
    coolant won't flow -

    your problem is NOT air flow past/through the AC condenser - or radiator
    your problem IS coolant CIRCULATION - or lack there of -

  3. #18
    franky de longueuil is offline Cadillac Owners Member
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    Re: overheating question ?

    Thanks for your guidance Basscat,


    The Water pump and thermostat are brand new

    I will have the radiator check INSIDE for blockage, or can I do it myself ?


    «To your answer :
    IF you have air pockets in the cooling system -
    and the purge line is not able to bleed the air out -
    coolant wont flow...

    I am not sure how check for air pocket, but I have checked and the coolant flowing out normaly from the purge line .

    Keep up the good work !

  4. #19
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: overheating question ?

    Quote Originally Posted by franky de longueuil View Post
    Thanks for your guidance Basscat,


    The Water pump and thermostat are brand new

    I will have the radiator check INSIDE for blockage, or can I do it myself ?


    «To your answer :
    IF you have air pockets in the cooling system -
    and the purge line is not able to bleed the air out -
    coolant wont flow...

    I am not sure how check for air pocket, but I have checked and the coolant flowing out normaly from the purge line .

    Keep up the good work !
    -----------------------------------------
    The Water pump and thermostat are brand new

    brand new parts could be defective -

  5. #20
    franky de longueuil is offline Cadillac Owners Member
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    Re: Overheating question - 1999 Deville

    I have tested the thermostat on my oven, it is ok
    The water pump (ac delco) has just been installed by a GM top experienced mechanic.

    I am thinking about removing the Thermostat and make a road test, to see if the coolant flows better !
    before removing the radiator.

  6. #21
    basscatt's Avatar
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    Re: Overheating question - 1999 Deville

    Quote Originally Posted by franky de longueuil View Post
    I have tested the thermostat on my oven, it is ok
    The water pump (ac delco) has just been installed by a GM top experienced mechanic.

    I am thinking about removing the Thermostat and make a road test, to see if the coolant flows better !
    before removing the radiator.
    ----------------------
    unlike almost every other car on the road -
    running a Northstar motor without a thermostat -
    is a guaranteed way to overheat it -

    I have tested the thermostat on my oven
    I HOPE you mean that you tested it by putting it in hot water -
    NOT in the oven -

    if you DID put it in a hot oven -
    go get yourself a new thermostat -

    either a Delco - or a Stant -
    with the "jiggle valve" -

    and when installing it -
    be sure the "jiggle valve" is at the highest point - 12:00 position -

    The water pump (ac delco) has just been installed
    by a GM top experienced mechanic.

    the GM top experienced mechanic
    COULD have installed a brand new DEFECTIVE AC Delco water pump -

    granted - it would be rare -
    I am only saying it COULD happen -

  7. #22
    franky de longueuil is offline Cadillac Owners Member
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    Re: Overheating question - 1999 Deville

    Yes I meant in hot water. ooups.
    Thanks for this info (now I know) : the "jiggle valve" is at the highest point - 12:00 position -
    how to check if the new water pump is working ?

  8. #23
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    Re: Overheating question - 1999 Deville

    If you checked and have coolant flow from the purge line, I doubt you have any air in the system (unless the HG is adding some).

    DO NOT remove the thermostat. If it's a quality thermostat (NOT AutoZone Don'tLast) it's probably fine.

    If the WP is spinning, it's fine as well.

    You could pull the radiator drain plug and see if you get any flow from the drain. If not, it's plugged and needs to be replaced or power flushed.

  9. #24
    mike5514 is offline Cadillac Owners Enthusiast
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    Re: Overheating question - 1999 Deville

    Loosen the top radiator hose at the radiator run engine cold about 1800 RPM and remove hose just to the point coolant comes out just maybe air will come out with it. a proper system will have the hose feel very firm and very hot at running temp. Wear proper protection. Mike

  10. #25
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    Re: Overheating question - 1999 Deville

    When the H/G went on my 98 Deville, it would overheat going up this hill coming home from work. There was no place to pull over until after I coasted down the hill, and by then when I would pop the hood the radiator seemed cool. There was a big pocket of exhaust gas that made the water pump cavitate, and the coolant was not moving at that point. Replaced the H/G and timeserted the block, and no more problems.

  11. #26
    franky de longueuil is offline Cadillac Owners Member
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    Re: Overheating question - 1999 Deville

    Bad news,
    I took my radiator to a Radiator shop today for cleaning and testing.
    No leaks, unblocked, Like the guy said : IT SMELLS LIKE A COMBUSTION CHAMBER.
    Leak down test and block test are still negative. So there must be a mysterious crack somewhere.
    Before I replace this engine I have nothing to loose and I want to try a long shot...,
    So which stuff should I put in the coolant system, there are so many on the market which one ???

  12. #27
    MoistCabbage's Avatar
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    Was the block test done right after adding coolant?

    If the radiator is still not getting hot, you still have a FLOW PROBLEM.

    None of that crap will do any good if you have pulled head bolt hole threads.

  13. #28
    Ranger's Avatar
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    Re: Overheating question - 1999 Deville


  14. #29
    franky de longueuil is offline Cadillac Owners Member
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    Re: Overheating question - 1999 Deville

    One last thing,
    the rad specialist said if the catalyst or exhaust might be blocked !

  15. #30
    franky de longueuil is offline Cadillac Owners Member
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    Re: Overheating question - 1999 Deville

    I just read this excellent post . Thank you all...
    and I will do another block test the proper way with engine hot.

    http://www.cadillacforums.com/forums.../t-205284.html

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