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Why does the HVAC fan motor keep running sometimes after the engine is shut off? on 2004 Volvo XC90

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It is not the fan motor for the radiator. The car has climate control. However, the family added a custom radio and bluetooth.
(2) Answers
(2) Comments
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the radio may have its wiring tapped into the wrong pwr lead, take it back and havethem ck there work
This is normal. If you have run the A/C while driving, the heater fan will turn on after the car is shut off to help remove moisture from the A/C Evaporator. Allowing the moisture to remain can cause bacteria growth, which is why A/C systems can smell funny at times.
You may see this referenced in your owners manual, but I'm not positive.
I replaced the vent motor and the controller, which mounts on top of it. This should have been a very tough job, but I had a small helper who could make the change when the dashboard was only moved, not removed.
The controller was tested and bad, but we replaced both.

Thanks to all.
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