I think it's caused by your screen name...

No, seriously. I had a 606 turbo in the 210 chassis, so we're comparing two different types of apples. However, it pretty much sat on ~82 all the time. Highway, city, stop and go in 105F heat, it didn't matter. Don't think I ever saw it hit 90. Of course, I never tried driving it up a mountain during the summer either.

I like your water pump theory. I think the plastic vanes was a BMW problem, not one of ours. I would also look into a good citric acid flush of the engine/cooling system - you could have scaling problems causing it to run hotter.

- JimY