No I am not a troll. engine bay pick attached. and its not a blast off hot air that comes out of the vents its only a small amount off pressure that comes out ( but still noticeable ) i have worked on my own cars for over 10 years now and i have never came across this either hence the reason im on here trying to find out as to why and how. and yes the heater works fine although it is more noticeable when the heater is turned on