When running my AC my aux fan on my 87 300D won't come on untill the car is about to overheat @ about 117c. In fact I'm not shure it even comes on when the car is running. I know it works because It got real hot on me the other day so I shut the car off, but left the ignition on and the fan came on then. So does anybody know if I can replace the relay to make it come on at a cooler tempature? Or could it be something else thats making my car get hot in the first place? thanx...