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How to fix coolant leak associated with the upper intake housing 2002 Buick LeSabre?
Wiki User
∙ 15y ago
If this is a 3800 V6 then the leak is more than likely at the intake plenum. Be very careful with this one, as you can easily have hydro-lock and do serious damage to the engine. Remove all spark plugs, and disconnect the coil wire, remove the intake and check for cracks or if it is warped. When replacing the intake get the new gasket from a GM dealer, as GM as come out with a redesigned gasket to help prevent leaks. After re-installed the plenum, turn the engine over with the plugs still removed. See if any coolant comes out of the cylinders. If not, install the plugs and start the engine. If you see coolant, make sure all of it is removed before starting the engine by turning the engine over a few times. Pour some diesel fuel or kerosene in each cylinder and allow it to set overnight. Change the oil and filter the next morning and then turn the engine over again to blow out any remaining diesel or kerosene. Install the plugs and start the engine. Hydro-lock is a distinct possibility and will cause serious engine damage, as in bent rods, if you do not remove the coolant before attempting to start the engine. As having worked at a Buick dealership I have never had a buick 3800 with bent rods from a hydro-lock. We have had to replace starters that were broke due to this. The mechanic usually took about two hours and it was on its way!
Wiki User
∙ 15y ago
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