Quote:
Originally Posted by Ferdman
Coolant temperature should remain essentially constant when the ambient temperature is 30 degress F, around 80 degrees C. I would suspect a thermostat, stuck partially open, is causing the coolant temperature fluctuations. Install a new Behr or Wahler thermostat in your 1993 400SEL.
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When car is warm , and upon rapid accelleration , could weak coolant hoses cause a loss of vacuum that causes the car to miss, stumble, almost stall and raise the engine temperature at the same time as per this thread
http://www.peachparts.com/shopforum/showthread.php?t=271154