two things come to mind when you tell me this. one is the unit is frozen up, happened to me once, I just turned off the unit and let it defrost and started back up and it worked again. if you lost Freon most RV dealers will tell you that you can't add Freon, they want to sell you a new unit. there are no openings to add Creon to these A/c's. I have heard of some guys on here that have gone to furnace and A/C places and they have soldered in ports and serviced but I think they are far and in between.