Hi, my R170 (SLK230) 1998 with 30k miles, started overheating. I replaced thermostat, drained and replace coolant but still the car overheats. So, I replaced the cooling fan module but still did not solve the problem. BTW the radiator icon on the dash lights up on and off. The electric fan runs when I connect it directly to the battery. I have gone through the forum searching for similiar problems but I could not find a solution to solve the problem. Could the coolant temperature sensor be defective. I am hoping that someone in the forum could help me solve this problem. Thank you.