Jmichalson

Did you ever figure out what the issue was? My 2022 AT4 just did this for the first time today. I turned the heat on high, and after about 10 seconds the fan speed lowered down to what seemed like medium, and there was a noticeable whistle coming from below the glove box. The setting was still on high, but it was not moving as much air, and it had the noise. The next time I turned the truck off, I started it and everything was normal.