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Old 06-05-2021, 01:55 PM   #1
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AC Not keeping up

Hello everybody, first I wanna thank everyone for being so helpful. I haven't figured out how to directly respond to a message yet. So my question is this when it gets very hot my AC units seem to have a problem keeping up? Has anyone else had this problem?Is there a fix? I have a 2015 Rw38GK15
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Old 06-05-2021, 04:49 PM   #2
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Define "very hot"! Anything over a 100 degrees without shade you'll probably be lucky to keep the inside near 80 with both A/Cs running nonstop. A couple portable fans in either end will help.
Realize you are trying to cool a 40' tin can with minimal insulation in the ceiling, only about 2" of styrofoam in the walls & slide ceilings & next to none in the floor.
However there are several previous post with ways to improve the air flow thereby helping the cooling somewhat, use the search function or the how to section.
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Old 06-06-2021, 02:19 AM   #3
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Im not familiar with the GK floor plan. On our 39MB we find it useful to adjust the ceiling vents based on the time of day and where were spending our time. Our forward bathroom is always closed off and so is the door. We use the day nightshades to keep direct sunlight out of the coach as well. Fans also quite helpful. We are Boondocked at the moment and able to put up sail shades to reduce the direct afternoon sun on the front cap. That made a big difference.
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Old 06-06-2021, 10:33 AM   #4
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Last fall I was on the roof cleaning the condenser coil and installing Micro-air soft starters in both of my AC units. I found there was a 1" thick x 16" long piece of sealing foam that runs along a wood blocking inside the AC units discharge , this foam seals the cold air supply side off from the return air to the unit. 80% of the foam was pushed out and was letting the air short cycle from supply to return , this was constant of both of my roof units. The foam that was in the slot was all twisted up and would not stay strait so I replaced it and held the new piece in with caulking instead of the double sided tape the factory used that dried out and didn't stick any more.

You will need to go up on the roof and remove the outside plastic cover then remove the sheet metal cover on the forward side of the AC units , there is about 20 #2 philops head screws that hold the cover in place. You dont want to remove it 100% because there is a splice box for the 120 volt power and thermostat wires on the forward side part of the cover , its inside the return air inlet and held to the cover by wing nuts inside. Just peal back the back half of the sheet metal from the compressor side to the front leaving the front close to its original location. Chance are your going to see a black piece of foam pushed into the return air section , this is the piece your going to fix. It seals off supply air to return air to the unit. I would guess 1/4 to 1/3 the amount of supply air in my coach was going right back into the return section and never making it to the living space.

All the other comments above are correct , follow them . Pull your window shades , put out your awnings, try to find a side with afternoon shade , cover your window with UV see thru film. Be proactive and start your AC early AM and keep the doors closed (closits,bathroom). You can not keep a coach this side cool on 100* days in the sun without doing everything possible to help it. 90* days should be fine . I have two 15K roof AC and really if your down south you need 3 roof units.
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Old 06-07-2021, 04:42 PM   #5
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There are several RW owners that have experienced this issue and took to home remedies to fix..

* - The vent collars were too long into the vents
* - The vents were NOT sealed between the HVAC duct and collar
* - The foam separator in the condenser had fallen over
* - The front cap had virtually no insulation between the cap and the shoe racks

On my late 2015/early 2016 I did the above fixes and was happy with my AC performance after... now that I have a 3rd AC, I have NO ISSUES with cooling.... It gets downright COLD in there
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Old 06-08-2021, 04:30 PM   #6
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As Ford Truck Guy said I have a 2015 GK38 and I did all the things above because I had the same issues with the air keeping up. First there are 4 screws in each shoe box in your front closet. Remove these, then take out the boxes which will give you access to the front cap. I added 2 extra layers of the aluminum bubble insulation 14R total gluing it to the cap with 3M spray adhesive. After that stuffed a roll of 15R pink insulation between each side of the center box shelf area. Closet went from 125 degrees to over all coach temp. Big help. Then I pulled one of the vent outlets measuring from the top of the supply vent duct to the edge of the roof. Well 1/4 to 1/2 an inch was total crap..... at the same time noticing the open gap between the supply duct and ceiling where the cold air could be pushed into. Taking aluminum duct tape I sealed all the openings and cutting off the vent tubes I increased my air flow by 75%. At 95 degrees my air conditioning cycles. Hope this helps.....

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Old Yesterday, 01:19 AM   #7
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This is my 2nd Redwood 3941FL and this one has more black paint for starters. I am partially under a pine in Florida and I am not keeping it under 80 while set at 80. My kitchen and bedroom are the full height rooms and they're the ones struggling. They don't seem to turn the air enough so I suspect the system is not sealed well
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Old Yesterday, 11:15 AM   #8
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I made all the changes some time ago posted by Ford Truck Guy plus a few more and our A/C performance is now acceptable all summer long.

1. Vent collars were too long into the vents, shorten the collar for better air flow
2. Vents were NOT sealed between the HVAC duct and collar, sealed vents so cold air does not leak into the attic space
3. The foam separator in the condenser had had fallen out, sealed with foil duct tape
4. The front cap had virtually no insulation (it had fallen down) climbed in front cap area of our 38FL and added insulation and secured it so it would not fall down (made a big difference in Front Living Room area)
5. Added ceiling registers (according to A/C manufacturer Redwood should have installed a minimum of 5 Registers per A/C unit (we only had 7 registers total, now we have 12 total, much better Air Flow / AC performance)
6. Added 2 additional returns on each unit and unblocked return area restrictions for better air flow / AC performance.
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Old Yesterday, 04:49 PM   #9
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Smile Junk AC on REDWOODS

I have a 38Gk 2015 model. I have also done all the above mods. There is a sight that has pics of all the above mods so you can get a visual. That will help you a lot. One thing I have done also and it may have been mentioned. Is cut aluminum bubble insulation to the size of your windows. And then I used velcro strips to attach it outside to block the sun from penetrating those windows. No the wife doesn't like it. Neither do I. Looks Redneck! But it works. I also did the same for my AC covers on top. Again. doesn't look the best. But I am more interested in cool that looks. I already had cut this insulation for the inside of my windows as well. Don't forget to take your safe out and stuff the cavity full of insulation also for your closet. Or you can add an additional AC to your vent opening in the hallway of your shower and bathroom and stay cool. good luck!
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Old Today, 04:11 PM   #10
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Quote:
Originally Posted by mstan View Post
I have a 38Gk 2015 model. I have also done all the above mods. There is a sight that has pics of all the above mods so you can get a visual. That will help you a lot. One thing I have done also and it may have been mentioned. Is cut aluminum bubble insulation to the size of your windows. And then I used velcro strips to attach it outside to block the sun from penetrating those windows. No the wife doesn't like it. Neither do I. Looks Redneck! But it works. I also did the same for my AC covers on top. Again. doesn't look the best. But I am more interested in cool that looks. I already had cut this insulation for the inside of my windows as well. Don't forget to take your safe out and stuff the cavity full of insulation also for your closet. Or you can add an additional AC to your vent opening in the hallway of your shower and bathroom and stay cool. good luck!
It's not that the A/Cs on RWs are junk, they're the same brand as about a100+ other brands of RVs.
I'll say that I'm quit sure that there's not a single HVAC technician at the factory installing them & I'll admit more concern could be given as how they are installed, but welcome to the rv world.
With the fixes mentioned here, that a good many of us have done some or all, it should keep your RW comfortable without all the redneck camouflage.
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