Send back a defective part. Audi & VW Specialists. We are your auto experts. AUDI TT 11-13 climatronic (opt 9AK), heated seat (opt 4A3). Heater A/c Air Conditioning Blower Controls Audi Tt 2011 2012 2013 Heated Seats. 60-day replacement guarantee for defective parts. We answer every single message and never ever miss a single one =.