Mine did that over a week or so. It was a leak in the condensor. 100 degree weather and I couldnt take it anymore.
Just got it back. Almost need a jacket in the car even though its in the low 90s outsided
That's awesome, good to hear.
Mine was not blowing cold this past July, dealer fixed under warranty, I am in Florida, and have to dial it back after 20 minutes, it gets that cold.
We test homes AC's on properties we list for sale, houses should blow 17-22 degrees colder than "room" temp, if you aim a cheap Home Depot laser thermometer at the vents. I assume its the probably similar for Tahoes, which are pretty much a condo on wheels lol.
AC is a sealed system, freon loss is not normal, unless extremely minimal, never should have to really "top it off"