Hi, Bruce,
I have had good luck with the Graf water pumps. The first one was installed by a Mercedes specialist in Indian Trail, NC, along with timing belt and tensioner. Timing belt broke on Big Red coming home from Charlotte about 12 years ago. After new water pump was installed, I noticed temp gauge was reading about mid-range thereafter. I don't know if the Graf impeller was moving more coolant than the old one, but the engine did seem to run cooler even with the AC on.
Have you ever run Prestone Lox-Tox anti-freeze? It's a propylene glycol based coolant which won't hurt animals or children if they should accidentally ingest it. I've been using it for over 20 years and haven't had any problems with it.
Hope this helps.
Andrew
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