'05 A6 Blower motor or resistor....?
 

Finally fixed my car, and now the blower has some kind of issues. Does not work only when he wants to. I tried the motor itself, put 12v on it, and work just fine on high speed. I'm thinking of the resistor that controls the speed. I don't really want to buy a new resistor if it's not necessary. Any suggestion would be greatly appreciated.
Thanks