rob_lewis

That's what I'm expecting, they won't be able to reproduce it. Glad to know I'm not crazy and that others have experienced it!! Hopefully I can figure out a way to always make it happen. -Rob

@Silverado-Hareek: Might be a possibility. Handn't payed much attention to the exact condition it happens it, but will keep that in mind to check next time it does. Thanks for the idea! -Rob

I have not brought it up to my dealer as of yet. I was trying to figure out if it's a feature of the system or if something was wrong with the system. The owners manual states that the fan speed will change when the target temperature is met, however, that's only on the automatic A/C systems, which mine does not have. The other reason I haven't brought it to my dealer is I cannot reproduce it regularly. If I take it in right now and let them know that it occurs, they'll drive it for 5 minutes, say they can't reproduce it and give me the truck back. I am trying to figure out a way to make it happen on a repeatable basis so I can demonstrate it to a service person. Otherwise, taking it in would be a waste of time. Now, if there's some known issue that the service department would be aware of, I can schedule something. Hence, why I reached out to the forum to see if anyone else has experienced it before wasting time at the dealer for a "Well, it only happens sometimes and I can't tell you when it will happen" -Rob

Just joined the board and tried to search for any mention of something similar, but couldn't find anything. Just bought a base 2014 Sierra a month ago and have noticed that the fan speed seems to drop after a certain amount of time. Looking in the manual, that would make sense for the Auto A/C option, but mine doesn't have it. Whatever speed it's on, it will noticeably drop. Doesn't always do it, but finally did it with my wife in the truck, so I know I"m not going crazy! Anybody else notice this? Any way to override it? Changing the speed on the dial only changes it relative to the difference. In other words, if the drop was 40% in speed on medium, when I crank it to high, it blows faster, but only 40% of what high would normally be. -Rob