We have the same problem. We even took ours camper back to the dealer and was told everything is working fine that we just need to park the camper in the shade. To me the air conditioners they put in the side wall are a sorry excuse for an A/C. My opinion they should not say there is A/C in the camper. Saving our money to put a roof one on.
2005 GMC 2500HD Duramax Diesel w/430,000 and counting miles.
2002 Chevy Blazer chase vehicle
2015 Palomino Palomini 180FB
2001 Keystone Bobcat 289FBS