Ok, my husband and I just purchased a very well maintained 2006 Gulfstream Cavalier Travel Trailer. Everything is in GREAT working order but when I turned on the A/C the other day, it vibrates terribly and no cool air is coming out of the vents. My husband, of course, is in Brazil right now and won't be home for another month! I am by myself trying to figure out what is going on. I need a starting place....any ideas? Thanks for any assistance you can give me!!!!!