electric radiator fan runs constantly. on 2003 BMW 325i

The electric fan run if the engine is on always. The air conditioner is off and the engine is not even warm. All the coolant temp sensors seem to be working. The relay is not sticking because with the key on engine off and a scanner I can run the fan on then off. Anyone have any ideas.

Asked by for the 2003 BMW 325i
I wonder if the fan switch mounted on the radiator is shorted out. Disconnect the switch wires see if the fan stops running if so the switch is faulty. If it stays running with the fan switch wires disconnected the fan control relay may be "stuck". Autozone have some popular workshop manuals for free on line once you register (for free) on their website .There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You get a one year subscription to year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual. or try and get an online repair manual subscription.