Question about Pontiac Grand Prix

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LEAKING FLUIDS FROM PASSANGEGER SIDE OF THE MOTOR 3.8 SUPERCHARGE WE HAVE REPLACED THE WATER PUMP AND THE THERMOSTAT I HAVE M=NO IDEA WHAT IT COULD BE NOW

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  • Randy Hough
    Randy Hough Aug 23, 2010

    What color is the liquid? does it leak all the time? does it only leak when AC is on? Etc....

  • dcoyle689 Aug 23, 2010

    UH THE FLUID SEEMS TO BE CLEAR I THINK IT IS WATER PROBBALLY ATIFREEZE TOO, IT ISN'T LEAKING ALL THE TIME ONLY AFTERTHE CAR WARMS UP AND HAS BEEN DRIVEN AT LEAST 20MINUTES

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If the water seems to be coming out of the engine block itself it would be the welch plugs. To actually see them you either need detachable eyes or a flashlight and a small mirror. Welch plugs are brass plugs inserted into holes in the engine block. These holes were put there during manufacturing in order to clear the sand used in the casting process from the water channels. They do tend to rust through and replacing them can be a serious headache due to the diffyculty in accessing these plugs. Basically you would have to strip everything(ancilliary components, inlet, exhaust manifold) off the engine to replace one. It can be removed by hammering a screwdriver through one and wedging it out. Replacement entails using a circular drift to hammer it back in (after the hole has been cleared of rust)
Also bear in mind that if one is rusted through, then the others are not far behind. depending on the engine it could have any number from 4 to 10 of these in the sides of the block alone.
The picture shows a welch plug (circled) on a 26 year old Nissan without aircon, power steering or fuel injection and it is still the only one visible on the engine without removing components.LEAKING FLUIDS FROM PASSANGEGER SIDE - ae1b161.jpg

Posted on Aug 23, 2010

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