I removed my covers and the inside cowling on my 3 roof airs this morning so I could blow the dirt/dust off the coils and check the drain lines. I assume everyone who has roof airs, has drain lines that drain the condensation under the bus. It is rather important that we watch the drain lines, and make sure they are not stopped up. I know one Prevost owner who did not do this and it cost him over $8000 for repairs to the ceiling and wall of his coach.

If the lines stop up, it is very similar to what happens in your house. The water has to go somewhere, and when the trough inside the unit gets full, it starts running over. In your house, it usually messes up your carpet. In the bus, the water runs over in your ceiling area. It can do serious damage to ceilings, walls, and floors before you know what is happening. I would recommend checking your drains and running a small amount of detergent down the lines.

Fortunately, all my drains were working, but I still added a few drops of dish detergent and flushed the lines. I was careful not to get any of the detergent on the coils. In my case there is one drain on each side of the AC unit. The 2 lines "T" into one drain line that goes under the bus. It is a rather simple but important maintenance item. At least I have the peace of mind knowing that I "shouldn't" have a problem caused by a stopped up drain line.