Blower fan cycles while truck is turned off

[Havasubum]

I have a 2017 Denali and have had since new. I noticed that lately the HVAC blower fan cycles on and off while the truck is turned off, just after driving it.  Does anyone know why this is happening.  I've noticed that the amp meter is charging more and not dropping down like it used to when the truck is new.  I was wondering if the battery is circling the drain and not providing enough amperage.  I also noted that after the truck was parked for a couple of weeks, the compass settings on the Navi changed.  Thanks in advance for the help.

[Mercracing]

The blower running after shutoff is a program. I can’t think of Chevys name for it but it basically runs the blower a short time after shutoff to make sure there is no moisture in the vents.


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[mjm-1957]

After blow