I have just upgraded to the RNS double din unit in my 3.2 A3 2004 along with the climate control unit(smaller and lower down in the console). When i swith it on, everything functions fine. Temp and fan speed up and down fine. My problem is no matter where i direct the air, nothing is coming out of any floor, dash or screen vent. I can here the fan working but nothing....................... Your help will be much appreciated.