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We just got a 98 chevy diesel running that was doing the same thing as yours. The truck came from CT with no fuel additive put in it. The guy never plugged it in either. Was about -20 here in northern NH and that poor old diesel never had a chance. He was boosting and cranking for about 2 days till we dragged it into the nice and warm garage overnight, the next day we changed the fuel filter just because he never had and put some additive in his fuel. It fired right up.
Gold, seeing as you have to get a new water pump anyways, take the starter with you and have it tested.While you are removing it, you have a chance at looking at the connections, etc.May as well start a shopping list...