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An AC unit that is working properly should have a delta T of 17 to 20 degrees. The #1 problem with ACs that run but don't cool is airflow. If your units short cycle they will freeze up. Short cycling is when the input air and output air are not separated. If you look inside the air dump there should be a baffle to keep the 2 air streams separate. Also insure there are no dead spaces, ie, anywhere the output air can escape where it should not (inside the ducting). Other than this you can have someone check the Start/Run Capacitors. This is an easy check if you have a multimeter that checks capacitance but make sure you short them prior to checking. It's easy to get a major ZAP from Caps. The last thing that will be a problem is the refrigerant charge. And you will not find a certified Tech that will recharge an RV AC unit. They are sealed for a reason!I have 3 ac units on 38ERD . 2 of them are blowing at 89 degrees, it is 91 outside. I have shut them down and, restarted them. On luck, any ideas. It's a 2021 cedar creek 38 ERD.