Yep ... I have a feeling that many folks have too much coolant in their systems. Second "feeling" is that many folks have less than a perfectly sealed system (bad cap, small hairline cracks in overflow, etc).

Seems like you can buy a cheap tool to check the coolant ratio ... can't remember, maybe it simply determines specific gravity of the material against a baseline.

Final thought would be that the viscous clutch could be contributing ... same issue as with the tstat - i.e. the curve for its activation is temp based and perhaps it simply is activating too late in the cycle?

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg