Audi Blower motor Regulator resistor 4A0 820 521 A    5Ds 006 455 02  Manufactured by Hella, made in Germany.

Up for sale is a good used Audi blower speed regulator. Audi part#  listed - please compare this with your original, these are located in the cowell of the car under the plastic air shield. A failure of this unit will result in the loss of one or more fan speeds, or an nonoperational climate control unit.  Please match your original part number. This will work on many different Audi models with automatic climate control system, . List price at Audi USA is nearly $500! get this one for less than you would pay in tax at the dealer! I only sell the OEM units, never aftermarket so they are the same quality as your original. Thanks for looking!