Problem Alfa 146 air conditioning


I have a problem with my car, an Alfa Romeo 146, 1.6 petrol from 1999.
My fan is stuck at maximum speed, and the air conditioning button stays connected all the time.
I thought it was because of the fan or AC buttons, but I took the plugs with the electrical wires out, and it didn't have any result, the fan was running at maximum speed
So I have to walk with the safety removed, so that the fan stops working
Can you help me, tell me what the defect is?