2002 Deville coolant leak
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Northstar Engines and System Technical Discussion Discussion, 2002 Deville coolant leak in Cadillac Engine Technical Discussion; I have a 2002 deville with a leak in the middle of the water pump, it's not overheating and the ...
  1. #1
    stringfelloe is offline Cadillac Owners Member
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    2002 Deville coolant leak

    I have a 2002 deville with a leak in the middle of the water pump, it's not overheating and the heater in the car still blows hot, but the service engine light is on. Do I need to change the water pump or just a gasket?

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2002 Deville coolant leak

    A leaking water pump will not normally set a SES. Many past posts on changing Northstar pumps, some with pictures. If it's leaking from "the middle of the pump" do you mean around the pump pulley or on the other side, the water pump housing cover ?

    Read the sticky thread at the top of the main Deville page - "How to pull codes" - and get to the link which has .......OBD-II in the URL. The codes and their meanings can be learned from the site, and one will be the code which set the SES.

  4. #3
    stringfelloe is offline Cadillac Owners Member
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    Re: 2002 Deville coolant leak

    It's leaking in what I think is the middle of the pulley.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2002 Deville coolant leak

    Water pump time. Get the special socket with the retainer strap, or you'll need a spare gorilla to help hold the socket in the pump tangs. The pump comes out clockwise after removing the housing cover, usually with some sweat and, remembering the original tang location, goes back in counterclockwise. Might as well replace the tensioner and belt, too. No sense having to go back in.

    Either call Luke in Parts at Lindsay Cadillac over there -------> , or www.gmotors.com, or www.gmpartsdirect.com, or www.rockauto.com.

    Log into RockAuto and get to your car and find the water pump. Click on the picture or the (!) icon for a view of what you want.....

  6. #5
    stringfelloe is offline Cadillac Owners Member
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    Re: 2002 Deville coolant leak

    Okay, that's what I thought, thanks for your help, I will try and get it done tomorrow. THanks for the heads up on taking it off.

  7. #6
    00 Deville's Avatar
    00 Deville is offline Cadillac Owners Connoisseur
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    Re: 2002 Deville coolant leak

    While you are replacing the water pump. I would replace the old style water pump cover they are prone to leak and have been redesigned. I've had to replace them on both my 00 & 02 Deville's due to leakage.

    -redesigned cover p/n 12600022
    -redesigned cover gasket p/n 12600020
    -redesigned thermostat gasket p/n 12574478

  8. #7
    stringfelloe is offline Cadillac Owners Member
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    Re: 2002 Deville coolant leak

    Thanks I will take a look at that too.

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2002 Deville coolant leak

    If you have trouble getting the pump to break loose (not everyone does), a few short bursts from an impact wrench will usually do it.

  10. #9
    stringfelloe is offline Cadillac Owners Member
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    Re: 2002 Deville coolant leak

    Thanks to everyone for your help. It took a long time to do it. But I got the pump replaced and no signs of leaks. You guys were a life saver, I can't thank you enough. BTW, those stud bolts snap pretty easily if you try to tighten them too tight.

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