Join Date: Mar 2008
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If the water pump is dead (the coolant may have blown past the shaft seals), I would recommend a factory replacement. Same thing happened to me, and the truck was overheating on small grades with an aftermarket pump. I swapped it out with one from the dealer, and everything was fine. Might have been a fluke, but I would want to change the pump out only once if I had to do it over again!
BTW, the water pump may be okay, and the coolant was comng from the lower hose near the pump. I would just give everything in the belt's path a thorough visual inspection just to be sure...........