2000 Deville cracked head, blown gasket or What?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2000 Deville cracked head, blown gasket or What? in Past Cadillac Vehicle Discussion; 2000 Deville with 154K miles. I am having a problem locating where the engine is leaking coolant. And lots of ...
  1. #1
    cadillac-dude is offline Cadillac Owners Member
    Automobile(s): 2005 Cadillac STS, 2000 Deville DTS
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    2000 Deville cracked head, blown gasket or What?

    2000 Deville with 154K miles.

    I am having a problem locating where the engine is leaking coolant. And lots of it. The engine will only leak on cool down after you shutdown the engine for 30 minutes or so. Then you see coolant leaking in front of the Trans fluid pan right next to the exhaust pipe. There is a small opening between the oil pan and the trans pan. That is where I see the fluid dripping. I inspected all the hoses on the rear firewall and I also looked around the water pump and coolant crossover housing. The reservoir and all attached hoses look clean and no chalk. Could it be leaking from the head or block? Car does not over heat. Run and idles just fine.

    I have installed the following new parts:
    New Radiator with upper and lower hoses (1yr ago)
    new cap for over flow tank ( 6 months)
    no fog or haze on inside window

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  3. #2
    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
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    Re: 2000 Deville cracked head, blown gasket or What?

    Quote Originally Posted by cadillac-dude View Post
    2000 Deville with 154K miles.

    I am having a problem locating where the engine is leaking coolant. And lots of it. The engine will only leak on cool down after you shutdown the engine for 30 minutes or so. Then you see coolant leaking in front of the Trans fluid pan right next to the exhaust pipe. There is a small opening between the oil pan and the trans pan. That is where I see the fluid dripping. I inspected all the hoses on the rear firewall and I also looked around the water pump and coolant crossover housing. The reservoir and all attached hoses look clean and no chalk. Could it be leaking from the head or block? Car does not over heat. Run and idles just fine.

    I have installed the following new parts:
    New Radiator with upper and lower hoses (1yr ago)
    new cap for over flow tank ( 6 months)
    no fog or haze on inside window
    ---------------------------
    you need to pressure test the cooling system -

    you can "rent" - for free - a cooling system pressure test kit -
    from most big auto parts stores with a tool loan program -

    with the engine COLD - connect the pressure kit -
    pump it up to 20 PSI -

    if there is no leak - it will maintain that 20 PSI - forever -

  4. #3
    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 Deville cracked head, blown gasket or What?

    Crossover manifold gasket leaks are rather common on the 2000+ engines for some reason.

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