We have a 2010 Bighorn 3055. We have had it 2 months. We are currently camping in NM. When we first turn on the air, all the vents are putting out a good flow of air. After a couple of hours that stops. Right now, with the vent on the AC unit closed we are only getting a LOW flow of air out of the vent by the door and the vent by the bedroom sink. It is putting out 73 degrees but very low flow. If I open the vents on the AC unit it puts out a flow of 73 degrees but not enough to cool the unit. It is only 89 outside. HELP