[Lee S]

AFAIK John, the Webasto will fire up when the coolant is below 70 degrees and the outside ambient air temp is below 5 degrees. You should hear the pulsing of the dosing pump and there will be smoke/fumes emitted from just in front of the drivers side (RHD) front wheel in the under-tray.

To code in the Aux Heater screen, I just went into the AC/HVAC module in VCDS and selected option 7 - Coding and then added 2 to the number in the first box. Mine ended in 45 so I changed it to 47 and saved it and when you do an ignition off and then on again it will appear in the CAR > AC MMI menu.

Thanks guys, I have set my Aux Heater to come on this evening at 18:15 so I will nip out and see if I can hear any noises or gurgling. Bit odd that it had '3' in channel 10 of the adaption screen though if it didn't have a pump.

I have been thinking about this. I'm 99% sure I had this function when I bough the car. Then it went in to have a new instrument cluster fitted due to flickering lights on the speedo. There was a bit of a hoo-hah about it all from Audi and eventually it was done under original warranty. When I got the car back I noticed that "radio controlled clock" was an option on the MMI menu that was never there before (it doesn't work anyway as it doesn't have the module) but I'm wondering if they "accidentally" coded out the Aux Heater when fitting this instrument cluster. It does have the little flashing icons for the heating/ventilation when activated so that works.