TLDR: The auto A/C in my new truck is turning off on its own within a minute of the truck starting up. GM says this is the way its supposed to be. Is it?
I purchased a 2023 GMC Sierra 4x4 Elevation in July 2023 to replace my 2014 GMC Sierra 4x4 SLE. At the time of purchase, auto would shut off automatically within a minute of me starting the truck. It does not do it every time, but when the A/C is on high and the truck is really hot. I live in Florida, so it happens more often than not. This was not an issue in my 2014. The auto A/C would stay on until interior temps were reached.
I took it to the dealership three times. Each time they replaced a different part supposedly to fix the issue. Their fixes did not fix the problem. Then they called the GM Techs come to look at the problem. The GM Techs then said they were aware of the problem and working on a fix, that the issue arose in trucks after a certain software update, and they would not come out because they were working on a fix for it.
I waited several months, and I followed up with the dealership to see if they had come up with a solution. I was told that in January 2024, an update had come out to address "the unwanted turning down of auto a/c" that would fix the problem. It did not, so they opened up a case number with GM, and I had to bring my truck in again. GM ran a test and said it is now designed for this truck that the auto a/c to turn off so a driver can "talk" to the car, but it is not designed to come back on. I was told that all vehicles are now functioning this way and they would no longer work on the auto a/c in my truck and to not bring it in anymore.
Skip forward 2 months, I have a bad fuel injector so I took my truck in for service. The part is on backorder so my truck is at the dealership for who knows how long, and they had to give me a loaner truck (2024 GMC Sierra 4x4 Elevation). The auto a/c does not turn off automatically in this truck. It works how an auto a/c is supposed to work. My wife also has a 2016 GMC Acadia, and her auto a/c does not turn off like this.
So my question is does your auto a/c turn off within a minute of startup, or does it stay on until the internal temp is reached? I do not accept that this is how its is supposed to be.