Hi Guys, i have a 2014 plate Alhambra - Rear Heaters are not blowing hot air.

I dont know how the rear heater system works. There are two nobs on the back to control the heat and speed of fan and heat is up and fans are on but no joy !

There is a vent on the roof blowing air down, but it only blows cold air.

I had VCDS diagnostic done, and cleared the following fault


Address 18: Aux. Heat Labels: 1K0-815-071.clb
Part No: 7N0 963 271 E
Component: Zuheizer 051 2940
Revision: 00051000 Serial number: 09024297000000
Coding: 0000041
Shop #: WSC 00020 790 00000
VCID: 36621E4441477CF660-8062


1 Fault Found:
00664 - Fuel gauge
002 - Lower Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 7
Fault Frequency: 12
Reset counter: 90
Mileage: 57099 km
Time Indication: 0
Date: 2017.12.07
Time: 17:57:03

I am getting no faults that relate to the Aux heater.
I did notice a pop up notification telling me No ROD file found for:
EV_ClimatrinicSharan(unreadable number)01005(VW36*)
also there were more ROD files mentioned

Any ideas about how the rear heater works and why it's not blowing hot air ... ?

Thanks in advance!