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Tstat determines the minimum temp - if it is running at 70C then it is stuck open or not regulating appropriately.
In normal running, with enough cooling air over the radiator, the temp should rise to 82-85 C or so and stay pretty darn steady ...
Always a chance the gauge could be wrong, displaying 70C when it is actually 80ish ...
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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
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