Both ACs not working

[scootsk]

Good afternoon,
Returned after a day out and my rear ac was not running (only one I left on). It’s 78° outside, I had the thermostat set to 70°. Checked the breakers, not tripped. Turned them on and off. Shut off the thermostat. Checked the front AC and it worked. After about five minutes, I turned the rear AC on and it came on. I left again about ten minutes later and returned after an hour and both ACs were off and the inside temp was 78°. I don’t know where to start troubleshooting. Please help, I’ll be in Moab in a few days.
2019 3791RD.

 

[Daryles]

I think i would start by taking the cover off and check the coils. You can find YouTube videos that show how to do this.
Oil the motor shaft/bearings.
Open your air returns, clean the filters. Look around inside the cavity and make sure it is sealed up. Use foil AC duct tape. Mine had gaps in it. This draws air from the attic versus cabin air.
Trim out your return duct to maximize air flow. Same with your ceiling vents. Make sure the flange (neck) doesn't protrud too deep into the air duct (restricts air flow).