I have a 2009 journey, we spent 3 days at Destin, Fl the air temp. was 94 and inside the coach was 84, air ran all day and finely shut down at 8:00 when it started to cool down little is this normal or do I have a problem. It worked find at night when it was cooler This the first time we have used it in this kind heat. I have checked everything I know to check. Help please