Renault Express cabin fan

Hello, this is my first intervention so greetings to all.
I have arrived here to see if someone throws me a hand to solve the problem I have with the fan of the cabin of my Renault Express. A few days ago when I started the car I noticed for a moment - just an instant - a smell of something that burned, such as a resistance or a welding failure (I have worked in electronics), and the fan stopped turning. With Maña I have been able to extract the switch-mutator and I have checked it, there is not the failure. I am surprised that it is from the engine itself so I suspect that there must be in some corner - highly inaccessible - some circuit, plate, that controls the two ventilator speeds.
Let's see if you can help me. Thanks in advance.

Vin of the vehicle (17 digits)

VIN is necessary to access the Renault database and identify everything related to the vehicle, from inspection and location of components.

Hello, thanks for responding to my request.
Let's see if this is: VF1F401P409003638

Well, it seems that nobody can help me in this issue. Without air I cannot circulate when the windshield is tarnished so I have occurred to me the possibility of acquiring a mini heating fan as this: www.norauto.es/product/ventilator-calefactor-12v_272038.html
although almost certainly the heating is going to be an illusion with only 150W. I don't think this hot. Someone can advise me, tell me if this is effective or is throwing money.
Thank you.