Zahg, your coding on both cars is the same and is also the same as mine so don't think it's that. Maybe it is an adaptation channel - but sadly these are not well documented.
I have Aux heater but had to do some VCDS work for it to appear on the MMI and with timers. There was also an adaptation to add another line for engine pre-heat. The pre-heat function is not working as it requires a diverter valve.
There is also an additional pump required on the heater for full functionality, but I found an adaptaion to make the residual heat pump run that is on the heater matrix, and they do indeed blow warm air after 5 minutes, but I think it is heating the whole engine rather than just the heater matrixes so never gets very warm.
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