I just discovered this topic in Forum. Obviously I don't review the forum often, because I searched diligently when I initially encountered this problem with our 2018 Fleetwood Discovery 38F after we bought it new in 2018. I returned the coach to the dealer 3 times. Each time, they could not find a problem. They suggested I take it to Freightliner. I did, and spent $600, (while under warranty) only for them to tell me that the system is operating properly, although the temp drop across the coil is only 10 degrees. My background is the a/c business, so I know what should be expected. I called REV group and was advised that a 10 degree drop is acceptable (clearly they don't live in Florida). I considered using Florida Lemon Law, but we love the coach, except for this problem. This activity was all in 2018. After reading these posts, I called my dealer's service dept. and was advised that this is a now a known problem. It appears that this model was built with an undersized a/c unit. I'd be interested if anyone has discovered a solution, other than running the generator and roof air.
