2000 DHS overheats
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2000 DHS overheats in Past Cadillac Vehicle Discussion; I've had an overheating problem with my 2000 DHS. Took it to several mechanics and no one could fine anything ...
  1. #1
    DaleCad is offline Cadillac Owners Member
    Automobile(s): 1979 Coupe DeVille, and 2000 DHS
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    2000 DHS overheats

    I've had an overheating problem with my 2000 DHS. Took it to several mechanics and no one could fine anything wrong. The last Cad. dealer offered the most plausible explanation: a minor leak in the head gasket that is causing coolant to seep into the exhaust system when the engine has been running at a high speed for awhile (my problem only occurs on the interstate after driving 100 miles or so.) I do smell coolant in the garage after the car has been driven which tends to make me believe in their theory. However there is no coolant on the garage floor. They suggested pouring in a can of Stop Leak in the radiator but NOT the kind that's like Drano with the granules, but the clear kind. I haven't tried it yet. I want to get some other opinions before doing this. I also did a full coolant flush, new thermostat, all the usual things everyone suggested.
    Good luck. This is a common problem with these NorthStar Engines unfortunately.

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  3. #2
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
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    Re: 2002 Deville overheating

    Quote Originally Posted by DaleCad View Post
    I've had an overheating problem with my 2000 DHS. Took it to several mechanics and no one could fine anything wrong. The last Cad. dealer offered the most plausible explanation: a minor leak in the head gasket that is causing coolant to seep into the exhaust system when the engine has been running at a high speed for awhile (my problem only occurs on the interstate after driving 100 miles or so.) I do smell coolant in the garage after the car has been driven which tends to make me believe in their theory. However there is no coolant on the garage floor. They suggested pouring in a can of Stop Leak in the radiator but NOT the kind that's like Drano with the granules, but the clear kind. I haven't tried it yet. I want to get some other opinions before doing this. I also did a full coolant flush, new thermostat, all the usual things everyone suggested.
    Good luck. This is a common problem with these NorthStar Engines unfortunately.
    --------------------------
    The last Cad. dealer offered the most plausible explanation:
    a minor leak in the head gasket
    that is causing coolant to seep into the exhaust system
    when the engine has been running at a high speed for awhile


    do a BLOCK TEST - it is the DEFINITIVE test for failed head gaskets -
    ANY color change is a POSITIVE result - and that is bad -

    I do smell coolant in the garage after the car has been driven
    which tends to make me believe in their theory

    if you SMELL coolant - there IS an external leak somewhere -
    PRESSURE TEST the cooling system - find and fix the leak -

    They suggested pouring in a can of Stop Leak in the radiator
    DO NOT USE ANY STOP LEAK PRODUCTS -

    I also did a full coolant flush, new thermostat,
    all the usual things everyone suggested.

    did you check the PURGE LINE for a constant flow of coolant -

    This is a common problem with these NorthStar Engines unfortunately.
    BS -

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 2000 DHS overheats

    Posts moved to new thread from dead hijacked thread.

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 2000 DHS overheats

    If you smell coolant, but do not see a leak, chances are you may have a crack in one of the radiator side tanks. Coolant may be evaporating before it can drip and remember, the A/C condenser is in front of the radiator blocking the view of the front of it.

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