The AC is one of the first things I noticed when I test drove my 2018 Colorado. It felt like the blower was either too low or too high, the dial didn't seem to be really too gradual. Low - Medium felt like it didn't push out enough, and Medium - High felt like it was too loud and felt like anything from Medium - High was just straight up High, didn't feel like there was any real middle ground. This didn't sway my purchase because it felt like a minor annoyance to me. I haven't really noticed it again after driving it for a few months (purchased on Fathers Day), but maybe I'm just getting used to it, and now it seems fine lol Mine does't make any odd noises, just normal AC blower.