Hello all, I have a W126 Bj89 as 300. I bought it only at the beginning of the year, it was still cooler Now I noticed that the engine is getting very warm.The following problem: it’s warm outside, summer, sun etc., actually nice I drive slowly / stop and go / or have to stop = then my engine gets warm. (previously engine Temp: 80-85 degrees) At the moment the temperature rises to an estimated 110 degrees. -Quickly I turn on the heating and e r cools down a bit. -When driving faster I have no problems (motor Temp 85 degrees). What I noticed: If you look at the cooler from the front, there is a fan there. I have never seen it turn (bad or?). Does this not have to turn on if the engine exceeds a certain temp? It does not turn out or stand in, so it does not run after. I guess it is the “additional fan” and has the fuse 1 – which is also inside and lies on it The cable from the fan leads past the left headlight, there is also a kind of “plug”, actually I wanted to measure there, but I didn’t get it apart?! Could a thermostat be the culprit? Bzw can I test it? I would be very grateful about answers. Greetings