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).
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.