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  • Cooling problems

    Why does cold air come out of the outlet for the front a/c when only the back a/c is on? The Living area won't stay cool. I have closed off the airvent outlet on the front a/c but it doesn't help with the cooling problem in the back. The rig is a 2017 Montana High Country, rear living.

  • #2
    I think they share ductwork

    Comment


    • #3
      Must be. But there are a/c vents from the back a/c in the bedroom ceiling, so why would the back a/c ductwork include the front a/c when it has it's own venting?

      Comment


      • #4
        Originally posted by VBraun View Post
        Must be. But there are a/c vents from the back a/c in the bedroom ceiling, so why would the back a/c ductwork include the front a/c when it has it's own venting?
        I know it seems ridiculous doesn't. Make sure all vents are aimed away from blowing on the thermostat. Another tip is to keep the fan running on medium vs having it set to auto. Set the desired temp to 69*. And adjust your preference from there.

        With the info I just gave you, the units fan will be on all the time and the compressor stay on longer vs the whole unit turning off and on. This helps greatly in maintaining room temps more evenly. Mine is setup this way and has made it more comfortable when sleeping.
        Scott Luciano aka Montana Rover
        My better half is Pati aka Sunshine

        Lakeland, Florida

        1-Savior + 3-Nails= 4GIVEN


        2012 - Ram 3500 4x4 Longhorn Dually, 4:10 Max Tow PKG, Sun Roof, 440 HP 925 TQ, H&S Maxx Street Programmer

        2014 - Montana 3402RL, Paramount & Full Time Living PKG, Goodyear G614 Tires, Amish Made Furniture

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        • #5
          Both ACs share same duct. We always use both ACs. More pressure on ducts, more air from vents, cooler. We also added some extra vents. More cool, more quickly. Are you familiar with the dual zone system?
          when it is humid we run fan on high. The fins in the ACs collect moisture and sometimes freeze restricting air flow. When fan is constantly running on high, moisture is dried by moving air and freezing is relieved.
          Last edited by HOOK; 07-26-2017, 11:18 AM.
          Love playing in the "Father's" yard, enjoying His Creations!

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          • #6
            We have the same situation. Shared duct work is the immediate answer to your question. The bedroom always seems to cool better than the living area, probably due to the smaller cubic feet of space that it's trying to cool. One thing that helped us was to check the aim on the AC outlets. We've turned the four outlets in the living area and the one in the hall to direct air toward the rear of the living area. That helped. Although it might not be a favorable suggestion, pulling the window shades, particularly on the sunny side also helps. We bought a small circulating fan at Walmart. We place it in the bedroom aimed toward the living area to move some of that cooler air out to where it is needed. Finally, depending on your area, the filters in the ceiling return air ducts might need cleaning more often. You can usually look up at them to see the dirt. We have cleaned them monthly in dusty areas to every six months in less dusty areas.
            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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            • #7
              I just helped a friend of mine with cooling issues in his 2017. Give everything a check starting with the AC returns. The return ducts were compressed / collapsed because of insulation. There was AT MOST 1/4" space on one end of the duct the rest was squeezed down to a point that there could be very little airflow. This is what helps circulate air in the coach.

              Poor flow will restrict drawing in of air, reduce output at the registers and foul up what should be a sufficient system.

              inspect the plenum area of the AC for any loose or non-connected duct work as well.

              I would start there paying close attention to the volume of air coming out of your registers. This will be equivalent to what is being drawn into the unit from the returns.

              Please post back your findings!

              Eric
              Fifth Wheel: 2015 Montana 3750FL Tow Vehicle: 2013 Ford F350 6.7L Lariat, Crew Cab. Eric and Tina

              Comment


              • #8
                Originally posted by Egregg57 View Post
                I just helped a friend of mine with cooling issues in his 2017. Give everything a check starting with the AC returns. The return ducts were compressed / collapsed because of insulation. There was AT MOST 1/4" space on one end of the duct the rest was squeezed down to a point that there could be very little airflow. This is what helps circulate air in the coach.

                Poor flow will restrict drawing in of air, reduce output at the registers and foul up what should be a sufficient system.

                inspect the plenum area of the AC for any loose or non-connected duct work as well.

                I would start there paying close attention to the volume of air coming out of your registers. This will be equivalent to what is being drawn into the unit from the returns.

                Please post back your findings!

                Eric
                This is starting to be a common issue. Not good.
                Scott Luciano aka Montana Rover
                My better half is Pati aka Sunshine

                Lakeland, Florida

                1-Savior + 3-Nails= 4GIVEN


                2012 - Ram 3500 4x4 Longhorn Dually, 4:10 Max Tow PKG, Sun Roof, 440 HP 925 TQ, H&S Maxx Street Programmer

                2014 - Montana 3402RL, Paramount & Full Time Living PKG, Goodyear G614 Tires, Amish Made Furniture

                Comment


                • #9
                  Thanks for all the helpful hints. Will try them. One problem will be that we camp at many places that have only 30amp service so can only run one a/c. Return air check sounds promising. Have reoriented vents to the rear and will use our big fan in the bedroom doorway. Will let you know after next week, our next trip, how we do. Again, thanks for the feedback.

                  Comment


                  • #10
                    Understood! Perhaps you know someone with a generator with a 50amp receptacle? That would be an option! Not sure where you are located, but if you are some where in my vicinity, I would happy to bring mine out or you or you could plug into my 50amp plug in the driveway.

                    Well... I just looked at your profile...I need a really long extension cord!
                    Last edited by Egregg57; 07-27-2017, 11:08 AM. Reason: Added information
                    Fifth Wheel: 2015 Montana 3750FL Tow Vehicle: 2013 Ford F350 6.7L Lariat, Crew Cab. Eric and Tina

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