2002 Deville Overheating after Thermostat replacement
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Northstar Engines and System Technical Discussion Discussion, 2002 Deville Overheating after Thermostat replacement in Cadillac Engine Technical Discussion; Replace thermostat about a month ago and all worked fine, but now it is overheating again. Any thoughts? Help would ...
  1. #1
    JohnV is offline Cadillac Owners Member
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    2002 Deville Overheating after Thermostat replacement

    Replace thermostat about a month ago and all worked fine, but now it is overheating again. Any thoughts?
    Help would be appreciated. Thanks, John

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    2manyhotrods's Avatar
    2manyhotrods is offline Cadillac Owners Fanatic
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    Re: 2002 Deville Overheating after Thermostat replacement

    Air pocket maybe?
    They are a brute to bleed air out of.

  4. #3
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Not if the purge line is clear, then they are. Instantly self bleeding. Zero effort required.

    John,

    How hot is it getting when it's "overheating"? Under what conditions is it overheating? Idle? Cruise? When accelerating?

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    Re: 2002 Deville Overheating after Thermostat replacement

    check purge line if that is free flowing, get a block test done, sounds like early signs of HG.
    Replacing the Head Gaskets on a Northstar? Use our SureGrip Cylinder Head Stud Kit!


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    JohnV is offline Cadillac Owners Member
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    Re: 2002 Deville Overheating after Thermostat replacement

    One to two lines up on gage while cruising. Will come down to normal if left a idle for a short while, maybe 15 minutes or so.

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    04GrandAmGT's Avatar
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    Re: 2002 Deville Overheating after Thermostat replacement

    sounds like you might be lucky and just have a clogged purge line. theres a hollow bolt that the purge line clamps to thats normally the point where it gets clogged
    Replacing the Head Gaskets on a Northstar? Use our SureGrip Cylinder Head Stud Kit!


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    Re: 2002 Deville Overheating after Thermostat replacement

    Quote Originally Posted by 04GrandAmGT View Post
    sounds like you might be lucky and just have a clogged purge line. theres a hollow bolt that the purge line clamps to thats normally the point where it gets clogged
    To check the purge line: Start the car, remove the rad cap, and then remove the purge mine where it connects to the coolant tank. Coolant should be flowing from the line you disconnected. If not, it is clogged somewhere. Per Everett, the hollow bolt the purge line connects to is typically the culprit. Take some compressed air and flow it out. It should start flowing again. If that does not work, you can take the appropriate sized drill bit, and carefully drill the hole out to clear the crap.

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    maeng9981's Avatar
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    Re: 2002 Deville Overheating after Thermostat replacement

    Did you put the air bleed hole on the thermostat pointing at 12'o clock position?

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