What causes a blower to come on after the car is turned off?

A blower may continue to run after a car is turned off due to a feature called "afterblow," which helps reduce heat in the engine compartment or dry out the air conditioning system to prevent mold. It can also be triggered by a faulty ignition switch or a malfunction in the vehicle's electrical system. Additionally, some cars have automatic climate control systems that may keep the blower running to maintain cabin temperature for a brief period after the engine is turned off.