Old A/C ducts shedding foam insulation....

[ScenicCruiser]

Hi Guys and Gals! This is my first post on this forum so be gentle. We have a '94 Hitchkiker II 30' fiver. It has the A/c ducts in the ceiling. They must be lined with foam rubber as when we first turn it on after being off for a few days it blows out what looks like little black pieces of deteriorated foam rubber. Has anyone else had that problem and if so did you find a remedy short of tearing out the ceiling? Or could the material be coming from somewhere inside the unit? Thanks in advance for any helpful comments.

[ScenicCruiser]

Hi Guys and Gals! This is my first post on this forum so be gentle. We have a '94 Hitchkiker II 30' fiver. It has the A/c ducts in the ceiling. They must be lined with foam rubber as when we first turn it on after being off for a few days it blows out what looks like little black pieces of deteriorated foam rubber. Has anyone else had that problem and if so did you find a remedy short of tearing out the ceiling? Or could the material be coming from somewhere inside the unit? Thanks in advance for any helpful comments.

[Frankenstien]

1st things First WELCOME TO THE SITE!!!!!!!!!

Lotsa smart folks who are in the know on our stuff... Some by expierence some by proffession... either way I don't think youll be disapointed...

Most Ducted units are comprised of a standard Aluminum channel/// typicly 8-10" X 2 or 3" if you are getting Black foam rubber, most likley it is from the base of your ac unit. There is a large square foam rubber gasket that the A/C rides on, there may be some "dry rot" or small critter infestation causing this to deteriorate. A Gasket kit is not expensive <20.00, and the AC unit is not to difficult to remove. to remove: remove the 4or 6 screws that hold the facia plate, there will be 4 7/16th bolts that hold the unit down, remove these, unplug the 1 or 2 or 3 connectors that seperate the uper/lower unit... you will then be able to lift the A/C unit off the roof, I would suspect at that time you will see where the problem lies... I hope this helps.. and let us know the out come...

[ScenicCruiser]

Hey, Frank.... thanks for the tip. We just returned from a ten week trip from Kansas to the west coast and back. Fought the problem all the way and just assumed it was comming from the ducts. Then about the time I posted that it dawned on me it might be from an internal filter or something. Your analysis sounds even more probable. Won't get it taken off till later but will try to report back. No one on the RV.net forum seemed to have heard of the problem. Thanks so much for your confirmation of what I had come to suspect. That made it a lot easier to decide to pull the unit.