Purchased 2021 destination trailer with two Coleman MachA/C units. The air is cold. But the air is blowing from the side that has the filter on it. And pulling in air from the side that is meant to blow air. (The side with vents that open snd close). I put a dryer sheet up to it to verify that I wasn’t crazy. It did indeed get pulled to the side that should be blowing air. Why is this? Is it just that the cover is on wrong and needs removed and spun 1/4 turn? It is like this on both a/c units. Also, I have no air flow from any of the ceiling vents in the trailer.