Hi,

I've just had something similar happen to mine ?
I recently bought a 2005 3.0d & I am positive it had auxilary heating / vent listed on the screen, ( this is unusual in the UK where they normally only have aux vent as standard even though the heater is fitted ? ) I even remember showing my mate when I got the car. Anyway I never got around to testing it & in the meantime bought a V32 sat nav update disc for my MK4 system. Loaded this all ok but when I went to test the aux heater a few days later the option has gone
Still got auxilary vent but no heat option.
Asked on a UK forum & the original disc supplier but no-one ever had the same problem, I was starting to think I had imagined it but it appears you have had the same thing happen albeit with a different system.

Regards Phil.