Question about 1999 Cadillac DeVille

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Water driping from the back plate of the thermostat housing ran hot yesterday tried to add water noticed tht it was coming frm somewhere behind the thermostat

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Hello: This was (and is) a common problem with the northstar engine. The gasket design/composition has been changed three times. The gasket on the thermostat housing needs to be replaced.

Posted on Sep 10, 2010

  • Darryl Kazemba
    Darryl Kazemba Sep 10, 2010

    You also need to make sure the gasket that seals te waterpump is not leaking. From underneath look up at the bottom of the waterpump housing, Check for coolant or signs of coolant. (if leaking you will need a special tool to replace pump/gasket.

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