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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 02 DTS overheating in Past Cadillac Vehicle Discussion; Originally Posted by 02-Deville When the car is running and worm I grabbed the hoses and there was no fluid ...
  1. #16
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: 02 DTS overheating

    Quote Originally Posted by 02-Deville View Post
    When the car is running and worm I grabbed the hoses and there was no fluid flowing through them. They were squishy when they should be hard
    ---------------------------------
    They were squishy when they should be hard
    you are confusing system PRESSURE - and system FLOW -

    the very BEST indicator of system FLOW is through the PURGE LINE -

  2. #17
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok. That purge line is a hole new thing to me. But fluid should still be flowing through the radiator. When I rev up the motor the fluid in the tank will go down and when I let off it fills right back up.

  3. #18
    basscatt's Avatar
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    Re: 02 DTS overheating

    Quote Originally Posted by 02-Deville View Post
    Ok. That purge line is a hole new thing to me. But fluid should still be flowing through the radiator. When I rev up the motor the fluid in the tank will go down and when I let off it fills right back up.
    -----------------------------
    That purge line is a hole new thing to me
    the PURGE LINE is unique to the Northstar motor -
    it is the ONLY way to purge air from the cooling system -
    hence the name - PURGE LINE -

    if there IS air in the system - you will NOT have circulation -
    the water pump can not pump air -

    go back and read #2 - THEN follow the directions -

    there is nowhere in the cooling system
    that you can actually see coolant flow -

    EXCEPT THROUGH THE PURGE LINE -
    providing the PURGE LINE isn't plugged up -

    like Ranger said in #14 -
    If the belt is attached, the tensioner is not frozen
    and the pump pulley is turning, you have coolant flow

    --------------------------
    EXCEPT IF THERE IS AN AIR LOCK -
    due to a plugged PURGE LINE -
    --------------------------

    something you said does bring up a question -

    When the car is running and worm
    I grabbed the hoses and there was no fluid flowing through them.
    They were squishy when they should be hard


    if you are saying that the engine was at full operating temperature -
    and the system was NOT pressurized -
    either the pressure cap needs to be replaced -
    or you have a leak in the system - bleeding off pressure -

    coolant NOT under pressure WILL boil around 215* -
    and that could explain a lot -

  4. #19
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    The purge line is not unique to the Northstar. Many cooling systems use one, just under different names. Degas line for instance.

  5. #20
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    I was going to try a new cap today if I can get one today. I'm just hope its not a hg or a cracked head.

  6. #21
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: 02 DTS overheating

    Most cars/trucks with divorced pressure surge tanks have purge lines. Ford calls it a degas line - in the F-150 series - check out the drawing ..................

    The chances of having a cracked head are slim and none.

    Surge tank caps are a dime a dozen at any parts store or NAPA. probably even at WallyWorld. Your DTS uses an 18# cap.

  7. #22
    Ranger's Avatar
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    Re: 02 DTS overheating

    Quote Originally Posted by MoistCabbage View Post
    The purge line is not unique to the Northstar. Many cooling systems use one, just under different names. Degas line for instance.
    Standard on every engine with a pressurized surge tank.

    ----------

    Quote Originally Posted by 02-Deville View Post
    When I rev up the motor the fluid in the tank will go down and when I let off it fills right back up.
    That is exactly how it is supposed to operate and why it is called a "surge" tank.

  8. #23
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    I hope that the cap does the trick.

  9. #24
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok put a new cap on and let it run for like 20 minutes was fine never went over the halfway mark. So I turned the heat on hi and it came out super hot for a while then got cold so I messed with the control and it went back to super hot. Should I be worried about it getting cold

  10. #25
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    Re: 02 DTS overheating

    That is a sign of air in the system. Gotta have hot coolant in the heater core to get heat. Air won't do it. See if it happens again.

  11. #26
    MoistCabbage's Avatar
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    A bad cap can cause coolant to be purged under normal system pressure, it won't cause an overheat until the fluid level is low enough. The cap also has nothing to do with cold heat (air in the system).

    Have you checked the purge line properly yet?

  12. #27
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    I was letting it cool down before I pull that off again to make sure it was still good. Last time I pulled it off and blew it ouf with an air hose and I even pulled the hollow bolt out and cleaned it out.

  13. #28
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    Re: 02 DTS overheating

    No need to pull anything unless it's clogged. Just remove the line where it connects to the surge tank (engine cold). Stick it in the open tank neck and start the engine. If you have coolant flow the line is clear and not a problem.

  14. #29
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok. Thanks for all the help guys.

  15. #30
    02-Deville is offline Cadillac Owners Member
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    Re: 02 DTS overheating

    Ok guys the cap didn't help still overheating. Not sure what else to try. I'm about ready to haul it in for scrap

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