There may be moisture in the car - in the seat fabric and in the carpets etc. - ventilate it as much as you can and allow the mosture to evaporate. The warmed air is absorbing the moisture and the blower is spreading it around the interior.
Only garage the car when it's had a chance to cool down. If you can park it up for a couple of hours with all the doors open. Drive around with the windows open if you can stand it
Buzz Aldrin
March 2010