I have a 97 fleetwood jamboree. This is the first time I have had the camper out in cold weather and used the LP gas heater. For a day or two the heater worked perfect. I moved the camper to a new spot and enroute filled up with new LP. After getting to the new spot and truning on the heater got a very bad smell coming from the exahust and it eventually got inside the camper. The heater worked fine but the smell was awful. Could wind blowing in the exaust cause this? Could the compbustion chamber be cracked? Does anyone know what could be wrong?