On my 380sl the temp gauge starts to act up once the car gets to running temperature. One second it indicates 90c then runs to 110c then back down to 90c I have replaced everything (water pump, thermostat, temp sender, vico clutch, raditor) Also the aux fan runs constantly when I start the car. Could this be a short in the wiring, bad temp gauge, or something else. Does anybody have any thoughts on this problem????