How do you replace the water pump on a 1999 Chevy Express Van?
Hey Duc==This is kind of envolved. Get a manual on your van from a local parts store and it will tell you how and have pictures . GoodluckJOE
You have to replace the intake manifold gaskets, which is not an easy job but if your mechanically inclined it shouldn't be a problem .disconnect the battery and i can not stress this enough, mark the distributors position to the engine block if not your computer will set a cam to crankshaft correlation trouble code.