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Blower fan cycles while truck is turned off

Havasubum
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Havasubum Enthusiast

Havasubum

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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.

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