Nice work, Don's. Our water pump went out on our Suburban just before we were leaving to cross the desert in August. "Boo" that it went out, but "yay" that it happened before we left, instead of in the middle of the Sonoran Desert.
Anyway, we called Don's, explained our situation, and Luis, their long-time service manager, said "bring it in, man" (he says that kind of thing). It was done in 3 hours, THAT SAME DAY, no appointment, and for a very reasonable cost.
I've used Don's for about 5 years, and while they are not omnipotent, they do good, honest wrench work at a fair price. Plus, if you've got your tit in a wringer on scheduling, explain your situation, and chances are they can help you out.