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Saw dust in your ducts?

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    Saw dust in your ducts?

    Decided the other day to take a closer look into our A/C cooling issues. I did this to my unit and a friend of mine on this forum, also a 2014 Montana. I already went through my ducts and pulled them apart to see if they needed to be trimmed down to be flush with the actual ducting in the ceiling as written up by others. I was surprised to find my vent covers were only sticking up into the duct by a 1/8”, unlike others have posted being an inch into the duct. Maybe it has something to do with the newer build dates. Mine was built in August of 2013.

    Any way I headed to the roof. I removed the top cover of the rear A/C unit first, and then removed the 8 screws that covers the evaporator. Look at the pictures below. He’s your saw dust Keystone! Remember, that 2 images are my unit and the other 2 are my friends.

    We brought up a vacuum to remove the saw dust and cleaned the evaporator as well. We repeated this for the front A/C unit too. We found no saw dust in the front unit. We put everything back together and added extra insulation around the evaporators using foil tape NOT DUCT TAPE to secure everything together, in both units as you can see in the last photo.

    Before doing any of the above work we took vent temps using my IR in both of our units. Our units had been running all day and both units were in the sun. There was only a 2-3 degree difference between our units. Those temps read around 52-55 degrees. After adding the insulation our temps dropped down by 6 degrees to around 46-49 degrees at the vents.

    Another interesting find was if you had the rear A/C running and the front running on fan only, the duct temps showed a 20 degree difference from reading the rear ducts and working my way forward to the front ducts.

    If I kept the rear A/C unit running and turned off the front unit (no Fan or A/C), then there was only a 6-7 degree difference. Reading the rear A/C ducts closest to the evaporator I would get that 46-49 degree temps. The readings would get warmer as I went to the front.

    In closing to get the maximum out of your units, they must both be running on A/C mode. The duct readings only varied by 2-3 degrees this way. Hope this helps...


    Look at all the saw dust.  This is on a 3 year old unit. Look at all the saw dust.  This is on a 3 year old unit. Look at all the saw dust.  This is on a 3 year old unit. Look at all the saw dust.  This is on a 3 year old unit. Adding extra insulation.
    Scott L.
    2012 Ram 3500 Dually LongHorn
    2014 3402RL Legacy Edition

    #2
    On both our current and previous units we removed sawdust each time we cleaned the return air filters. I've also cleaned under the roof covers. I don't believe there is any factory procedure to keep the sawdust from construction cleaned up.
    Don Lee
    Full timing with a Madison, SD domicile.

    2012 Ford F350 Lariat - DRW 6.7L Diesel
    2016 Montana Legacy 3720RL with 8 - 150w solar panels, charging three lithium ion smart batteries, 2800w inverter.

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      #3
      Get them built and get them out.
      Scott L.
      2012 Ram 3500 Dually LongHorn
      2014 3402RL Legacy Edition

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        #4
        This is our 6th Rv and second Montana sawdust, metal filings were common in all of them. Our OEM vents did stick up over a inch into the ductwork and we changed them out to vents that were flush and blew air straight down.. Our A/C does well in average temps not so good in 100 degrees plus but these are RV's not a S&B.

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          #5
          Same thing with sawdust....also used Gorilla Tape to seal up the ducts better
          2014 Cedar Creek Silverback
          2010 Dodge Ram Laramie 3500 dually
          :cool:

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            #6
            Wow, I had know idea of the mess in there!
            2012 - 3400 Montana with paramount package
            2013 - GMC 3500 diesel

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