1999 Cadillac Seville OVERHEATING :( - Page 3
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Northstar Engines and System Technical Discussion Discussion, 1999 Cadillac Seville OVERHEATING :( in Cadillac Engine Technical Discussion; I'm running out of ideas, I sure would hate for the HG to go in 6 months after my warranty ...
  1. #31
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I'm running out of ideas, I sure would hate for the HG to go in 6 months after my warranty is done.

  2. #32
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    Ranger is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Well, if that is what you are worried about have the coolant tested again and/or a cylinder leak down test done.

  3. #33
    benmack is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I had another die test done and the color did change but it took about 30 minutes. The mechanic told me the reason it took so long is because it is a small leak. Does this sound like an accurate assumption? I am just trying to make sure the guy isn't trying to buffalo me

  4. #34
    mikelawson is offline Cadillac Owners Fanatic
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Unfortunately, you have a blown head gasket. I have repaired over 20 of these and all have the same symptoms as yours. I repair these for 1500 + parts, so if they only pay 2500, I could get you repaired for less than that, with a warranty. I'm in Ky, which might pose some issues, but you can email me if you have additional questions about your car. Mikelawson@ctky.com.

    Mike

  5. #35
    shea is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    right i just got mine and i just replace the radiator the water pump and the thermostat and its still over heating and when it does get hot i have no hot air or cold neither so i think i have a air pocket in it somewhere but I've tryed bleeding it out is there some other or special way to do so??

  6. #36
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    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Quote Originally Posted by shea View Post
    right i just got mine
    This is a heck of a way to say "Welcome Aboard !!!!!!.............."

    Before buying the car you needed to do some testing.........You now have a LOT of homework to do. If you have replaced most of the cooling system and the engine still overheats, then you have big problems. 1999 is the worst year for Northstars with blown head gaskets. Where did you buy the car, did you pay close to dealer Blue Book retail for it, and is/was there any warranty ??

    Check the purge line for steady flow - with the engine cold, remove the line from the nipple at the reservoir top side and hold it in the open filler neck. Have an assistant start the engine and let it idle. No flow and, YES, you have air trapped in the main cooling system. Clean out the purge line and the metal bolt/nipple at the rear side of the thermostat housing/water pump cover. If the purge line is totally clogged it can be replaced by a proper sized length of reinforced fuel line from any parts store. BUT, if it IS totally clogged, the chances of someone having poured some sort of block sealer in the engine are very good - and that's NOT good for you - $$$$.$$

    You should do a cylinder block test for exhaust gas in the airspace over the coolant in the reservoir - proper coolant level is halfway up in the reservoir, cold. www.sjdiscounttools.com/lis75500.html

  7. #37
    shea is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    yeah but my car i will get half way hot then it will go for about an hour then get hot very quick??

  8. #38
    shea is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    do u think my reservoir cap isn't holding all 15 psi's ?

  9. #39
    shea is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    i got it from lujacks with no warranty for 5,999

  10. #40
    ternstes is offline Cadillac Owners Fanatic
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    Re: 1999 Cadillac Seville OVERHEATING :(

    I would test the coolant for exhaust gases before doing anything else.

  11. #41
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Quote Originally Posted by shea View Post
    do u think my reservoir cap isn't holding all 15 psi's ?
    Possible, but not probable. Any radiator shop can test the cap for you.

  12. #42
    89falcon is offline Cadillac Owners Fanatic
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Quote Originally Posted by Ranger View Post
    Possible, but not probable. Any radiator shop can test the cap for you.
    Or you can just buy a new one CHEAP.....

  13. #43
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    Re: 1999 Cadillac Seville OVERHEATING :(

    This is an old thread. I'm sure the car has been junked by now.

  14. #44
    edb150 is offline Cadillac Owners Member
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    Re: 1999 Cadillac Seville OVERHEATING :(

    My shop has successfully repaired 98 Cadillacs with bad head gaskets, most had new water pumps, radiators, hoses, and fans etc etc. by the time they got to me. Unfortunately its usually the head gaskets. I have seen a couple that the test showed good but still had blown head gaskets. I have only tested 5 cars with the test as most are easily diagnosed without the test. Whoever fixes it make sure it gets inserts or studs or it will be time wasted. Not to mention money wasted.

  15. #45
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    Re: 1999 Cadillac Seville OVERHEATING :(

    Mark

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