I have noticed on my 24, the AC will at times, blow warmer air for maybe 15 seconds and then goes back to cold air. It almost seems like when you slow down a bit is when it happens. Its been really hot in Florida, and we just were on vacation and this happened numerous times. Is this normal? My 21 never did this. Like I said it only lasts for several seconds and then goes back to normal? Just was interested if anyone else has encountered this issue, and if it was indeed something that needed to be fixed. The truck is under factory warranty, but before I make an appointment, I wanted to see if it was indeed something that needs to be fixed. Thank you.