86 4000 quattro 177k overheats

[selick@cs.bu.edu (Steven Selick)]

Hi all...

I have an 86 4000 quattro with 177k miles on it and it is running way hot.
I brought it to the shop since I wanted them to take a look at the whole
car and see how it was doing, and they replaced the fan switch, and the 
thermostat. They said the radiator was not leaking, and it is still over-
heating.  The water pump is making some strange noises, but is not leaking.
What could it be?

Also, same car, the rear suspension makes a weird thump when going over
bumps. Is this just the bushings?

Thanks,
Steve
<selick@csa.bu.edu>