TD Smith

My 2019 Silverado AC rarely does not cool so dealer cannot diagnose because it works there. Yesterday it was 89 degrees and worked fine. We were at church for 1.5 hours and headed for a restaurant and was working fine. Outside temp shown on dash was 89. About 10 miles down the road it started blowing hot air. I looked on dash and outside temp showed 32 degrees. I’m guessing the computer wasn’t going to blow cold air. Finally temp increases on dash and cold ac again.