Another overheating northstar....
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Northstar Engines and System Technical Discussion Discussion, Another overheating northstar.... in Cadillac Engine Technical Discussion; First i wanna say sorry i didnt search alot but from what i did i really didnt find what i ...
  1. #1
    98northstarsts is offline Cadillac Owners Member
    Automobile(s): 98 seville sts
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    Another overheating northstar....

    First i wanna say sorry i didnt search alot but from what i did i really didnt find what i was looking for. I know they have head gasket issues and im hopin this isnt the case. It overheats roughly 30 mins after startup. Ive replaced both intake gaskets, thermostat, radiator, and the entire system has been flushed. The car runs perfect tho. Any ideas? Its a 98 sts

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    Faded Crest's Avatar
    Faded Crest is offline Cadillac Owners Connoisseur
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    Re: Another overheating northstar....

    If you checked over the entire cooling system, including the purge line that runs to the overflow tank then there is a good chance you are the newest member of the blown head gasket club...

  4. #3
    98northstarsts is offline Cadillac Owners Member
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    Re: Another overheating northstar....

    As i figured..... guess ill start pullin the motor tomarrow then. Any ideas on an est time on doin the heads? Im not new to mechanics but i am with the northstar motor

  5. #4
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
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    Why come for advice if you're already deadset that its the head gaskets. Have you even done a block test yet?

  6. #5
    Faded Crest's Avatar
    Faded Crest is offline Cadillac Owners Connoisseur
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    Re: Another overheating northstar....

    Definitely check that purge line first. In fact, a guy just the other day in another section of the forum found that his purge line was plugged which was causing his car's overheating. Do the block test after an overheating event for confirmation, but if you have already gone through the system, there isn't much left other than head gaskets.

    ----------

    If that is what it is there is plenty of reading to do here. A few guys (including me) are in the middle of doing the job... (But we are all going much deeper than just head gaskets.)

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Another overheating northstar....

    Might well be a HG, but follow the advice given and be sure. This is a big job. You don't want to end up with a heart bypass because of indigestion.

  8. #7
    89falcon is offline Cadillac Owners Fanatic
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    Re: Another overheating northstar....

    Quote Originally Posted by Ranger View Post
    Might well be a HG, but follow the advice given and be sure. This is a big job. You don't want to end up with a heart bypass because of indigestion.
    Unless you're the cardiologist getting paid to do the job......

    Same thing applies with the N*.....it's LIKELY the HG, but considering the expense, it's WELL worth it to rule EVERYTHING else out.

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