Re: Heater fan won't shut off
that would probably be the afterblow module, it may have a problem, it will run the blower for a set time after the key is turned off, it is supposed to do that, if it is equipped with a afterblow option. they do this to prevent mold from accumulating inside the blower case from moisture. whether or not that is what you are experiencing is beyond me, as i cant see the vehicle in person.
ASE Master Certified Technician
currently driving- 09 Chevy Impala LT, 83 Chevy Camaro Z28