C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

fan runs on too soon

Old Feb 16, 2022 | 11:00 AM
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mercedes c230 kompressor(1.8 192ps) sportscoupe
fan runs on too soon

my c230 w203 has the existing problem:the fan runs on at 85C°.this has the result to run the fan very soon before the thermostat is opening.to mention that the thermostat opens at 88-90C° to that until this temperature is running on high speed.after opens the thermostat at 90° the fan is lowering the speed and after a little is running on high again....this is not normal because outside is winter.and of course i tested with the aircondition off.when i turn on the air inside the car with with aicondition switch off,the temperature stay stable in 83C° but if ill close the air of the aircool the temperature grow up and the radiator comes on high until 90 C° when the trermostat is opening.i went to the MB mechanic and he cannot figure out because he tested and saw the something thing.he changed also a new thermostat and a temperature sensor but the car is soing the same...i need your assistance please if someone has the same problem or the any suggestion about this....
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