Vent door actuator?
 

Hello all, I have an 07 passat. The passenger side vents only blow cold air. The drivers side works as it should. I feel sure its the actuator. Took it to the stealership and thats what they thought also. $1100.00?? How difficult is this to replace and what should it cost? I replaced one in my Silverado and it was not too bad but not real fun either. Thanks.