My new 2021 Tahoe has a strange new noise that comes from the passenger front wheel well, before the truck starts as I approach the vehicle. I’ve only noticed it since the temperature dropped. It normally makes a sound, but this is different and loud and lasts about 30 seconds to two minutes. Ideas?

 

Warranty. Let dealer service know exactly this, and let them keep overnight to duplicate the issue.

 

And now “Service climate system. Defogging reduced” message came up on the screen when I started it.
I’ll make an appointment on Monday.