Hi everyone. My first post in BenzWorld. I have bought a 1992 500SE with full dealership service history but the car is de-registered since 2002 and has not been driven for 17 years. It has travelled 101,000km. I just fixed rough idle by replacing all spark plugs and ignition cables. But the car still has problems of overheating and no ac. The coolant temperature of 1998 S320 that I bought in high school never reach 80°C 😂😂😂 The gauge on instrument cluster shows 100°C-110°C when the car is on motorway and 120°C in traffic. So I do not drive this car anymore.... After some checks, my mechanics said the thermostat works, the radiator is good after flush and the fanclutch works. So I guess probably the coolant sensor is faulty? I have read many posts, and now know that this car has two coolant sensors and probably the climate control diagnostics will help to determine the faults. Anyone has ideas to sort out this problem? Many thanks!