Heater/blowers coming on for 30 secs once ignition is turned off

[Stevox6]

Hi, wondering if anyone can help… blower in the car ( 2011 audi a5 ) have been intermitent. Fitted a new resister behind the glovebox. But now when i take the keys out of the ignition the blowers come on about 10 seconds later for about 30 seconds and then go off. Any ideas.. could it be something else? Faulty blower fan? Also disconnected the pass airbag switch and once i put it back together its staying lit on the dash.. do i have to get this removed with vag now? Any help guys! Thanks