Radiator electrventillator BMW 320D 136CV does not go

Well, what has been said, the radiator electromotro does not rotate. When the A/A takes a breath for a while and then begins to connect and disconnect, without putting the electro -ventilator in progress. Looking at the electrical scheme, it says that 12V arrives directly from the 37 of 50a. In this fuse they are and this is fine, but the radiator connector does not arrive. I follow the wiring, it gets inside the habitaculus towards the fuse zone but it does not go directly towards these, so I think it must pass through some section that the manual does not indicate and lose the track. I would appreciate if someone could give me any clue to solve it and thus help more people because looking through the forums seems to be a breakdown that appears a lot. Greetings.

You have tried to put it direct current of the battery to see if when it has been working for a while it heats up and fails ... the same is a nonsense of those the electric motor is heated and stops the fan is broken, with this test discards the fan failure.
And if the fan goes well, you tell me to see if we take the current because it shows that the current passes through the thermocontact and if this chungo does not reach it, or the same switch of the A/a that can go in two ways or to a switchboard that when connecting the air of sending the current to the compressor of the A/A and the fan, or by relays without switchboard and if the relays do not reach the relays ...