Last night the temp was about 75 degrees and the car was out on the interstate highway going about 75-80mph, and the a/c was on. However, it seemed to actually be running cool, at around 82-85C! Upon stopping, it went up to about 92C, and no more. For now, seems to be o.k. An older Audi 20V 5cyl turbo sped up upon attempting to pass. 80-100mph comes quite effortlessly with the m104.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro