I recently bought a C180 2001 that is generally in excellent shape and runs well. However it has one annoying problem. Whatever I do the AC will always run regardless if in EC mode or anything else. The only time the AC compressor turns off is when I set the fan to 0. But it is getting winter soon and I need the car to heat. I suspect it is some faulty temperature sensor. I even tried to disconnect the AC fuse 41 and 51 but that completely turns off the control module. Any advise I would highly appreciate!

I have made a short video about the issue. I basically get constant cold air unless I turn the fan to 0.