Originally Posted by
redneck truck
I've never used the defrost functions in my Audi. Do both front (HVAC) and rear windshield defrosters disable when you turn the engine off? If so, leave the default setting to dash vent only, high fan, high temp when you turn the car off.
Just the rear windscreen, if you shut the car off with the HVAC set to defrost it will still be defrost when you start the car back up. Here in the PNW I leave my HVAC head is set to defrost almost all winter, moist coastal air at 5 or 6 degrees above freezing combined with 5 months of solid rain tends to lead to a lot of fogging ;) The only setting that automatically resets to off on my HVAC head is recirc.
Front heated seats will be on if the control wheel is left in an on position, the rear heated seats are only activated when the pressure sensors under the seats detect enough weigh that it thinks someone is sitting there. Those are the same sensors which automatically activate/deactivate the rear airbags. I generally leave my rear seat heaters in the 6 position all the time since I; a) rarely have rear passengers and b) most people would never think to look for seat heating in the rear so it lets them know the option is there.
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