theokgs

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....