My '85 300 dt (205000miles)after a long trip at 93*F.the electric fan works continue,doesn't matter if is cold or hot outside?Can somebody help me ?

 

Im pretty sure that your problem is a ruined radiator sensor. fortunatley this is an easy jerry rig fix. simply disconect ti from the circuit, and put a toggle switch in its place, wired into the cabin. then when you turn the car on, you just manually turn the radiator on, and off when you shut off. ive seen it before. its very simple to do if you know anything about these, engines, or electricity. you may be able to find directions online. to replace the sensor would be a few hundred with shoptime.