02071 Audi A6 with no heater blower. I walk through my diagnostic thought process on this A6 logging 02071 communication fault with no heater blower more. Join my channel on Instagram as @manishcartechnology. Install the app to follow my photos a Audi A6 - (Yauhen_D / Shutterstock) The most common causes for Audi A6 AC not blowing hard enough are clogged cabin air filter, dirty evaporator coil, and frozen evaporator coil due to low refrigerant. Less common causes are dirty or sluggish blower motor and faulty mode door actuator. Audi A6 models built from 2005 to 2007 have be known for having an issue with its pump valve unit; in fact, a TSB ( 2013833/5) was issued, recommending replacement of the old unit with a newly updated model. The problem occurs when the pump valve becomes blocked with engine debris. .

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