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Originally posted by rekatt
temp went 105ºC.After that I just parked the car home and I haven't driven it since.
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105 degrees is fine - the auxiliary fan should cut in at around this point and bring the temperature down. Check that it does.As the system is closed, it won't boil the water at this point because the pressure prevents it from doing so. You may also want to search/post in the diesel forum assuming this is a S350 turbodiesel.
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I consulted some buddies and they told me to turn the engine on and after it gets at working temperature open the radiator cap and see if the water is circulating
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I think that is a most insane idea..
IMO, when the engine is at running temp, you should put your hand on parts of the radiator and check it's not cool in any areas. That would check for a clogged radiator. Otherwise, if you haven't had a coolant flush and replacement recently, do that
more suggestions?