Since the purchase of the car, the fan worked only at max revs when the climate control was turned on. The reason for this was a not working ECU of the fan. I decided to change the ECU, I found out on the forum that now improved ECUs are installed (I also found replacement specialists there).
Major improvements:
Reverse polarity protection.
Two powerful output transistor stages.
Improved heat sink and resistance to mechanical destruction due to a solid board on aluminum base.
Improved anti-corrosion protection due to silicone filling compound.
Repair of the electric fan for Peugeot & Citroen 2002 – 2007