How difficult is it to replace the water pump on an '03 Express with a V6?
The fact that it is a van will make it more difficult than, say, a pickup truck, but it should be fairly straightforward. You will need a special tool to remove the fan/clutch assembly, since it threads onto the snout of the water pump rather than bolting on like the old ones. My favorite kind attaches to an air hammer and loosens it up with a single pull of the trigger. Other than that, it’s basic nuts and bolts, coolant flush, all slightly complicated by a slight lack of room.