What chassis do you have? I have a 115 chassis 230 gas burner and its turn signals did not work when I got it. I had to get another Turn Signal Relay, mounted underneath the drivers side of the dash near the steering column. I did have a 240D in the 123 chassis, but I don't remember if the relay was in the same place or not. Normal operating temp on my 240D was slightly above 80 degrees Celsius, but would run hotter at 80mph in the summer.