Recently drove 1600 miles in my 1976 240D. After the trip I noticed that whenever I would idle the car for longer than 5 minutes the engine temp would approach 120 Deg C. Not a comforting sight to get back in your car after running in a gas station for a soda and see your temp gauge pegged!!!
What could the issue be? As soon as I start driving the car cools down almost immediately, heck even if I slightly rev the engine while keeping the car in Neutral it will cool down.
There are no evident leaks, I'm not losing coolant, no coolant in oil or vice verse (just changed oil/coolant after the trip) the car seems to be running fine otherwise.
If someone could give me some advise, I sure would appreciate it. It's never done this before!
---------- Post added at 00:16 ---------- Previous post was at 00:10 ----------
And by the way its 34 deg outside and it overheated, While idling, funny thing is the engine sound doesn't change when its overheating. Very curious.