i started getting an electronic whine kinda noise coming from the passenger side a few months after i bought my 2019 silverado. It definitely was not there at first, and was not in the loaner truck i had a couple months ago when they were working on stuff. it is for sure louder at lower fan speeds. the dealer replaced a fan assuming it would fix it but it didnt. they then were supposed to change a resister or something near the floor on the passenger side (thats where the noise appears to come from for me) but that did not fix it and they told me they called GM and they said it is normal, but i dont buy it. i am also not 100% sure if they actually changed anything the last time, or if they just called GM and then decided not to change anything based on what they said. Needless to say i am going to keep having them look at it because i know its not an issue on all of them at first.