Go Back   Montana Owners Club - Keystone Montana 5th Wheel Forum > MOC on M.A.R.S. > Montana Problems, Problem Solving & Technical Help
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 11-16-2017, 10:19 AM   #1
John Shasky
Established Member
 
Join Date: Feb 2011
Location: Tubac
Posts: 19
M.O.C. #11165
Question Air Conditioner return Duct

I am having a problem with the rear AC not performing as it shouldI have read many posts abut rear air conditioner problems and some regarding collapsed return ducts. I have a 2014 3402RL Montana. The return duct is in fact collapsed to about 38th inch. I have tried fixes to prop it open. Since the ceiling and roof is curved I have found nothing flexible enough to span the duct. i also don't want to block air in the process. Worried also about damaging the duct. Tried pvc pipe, golf balls to no avail. Any ideas? Maybe i need to cut a new vent hole in the center below the AC? Increased noise? Or could replace existing return air intake vent covers with larger ones? I have an extend warranty but hate to deal with the dealer who would charge for evaluation and tell me it is performing as designed. It is not!
John Shasky is offline   Reply With Quote
Old 11-16-2017, 11:25 AM   #2
WeBeFulltime
Montana Master
 
WeBeFulltime's Avatar
 
Join Date: May 2011
Location: Hixson
Posts: 2,585
M.O.C. #11397
Have you considered using 3/4" or 1" flexible tubing? Should be able to get it at any Lowes, Home Depot, Ace, etc. It is normally clear and thin walled.
__________________
2018.5 Montana 3791RD
2012 F350 SRW 6.7 PSD

Full Timing since September 1, 2010
WeBeFulltime is offline   Reply With Quote
Old 11-23-2017, 05:25 PM   #3
Rex-
Established Member
 
Join Date: Mar 2016
Location: Groveport
Posts: 11
M.O.C. #18362
We have a 2016 3791 that has compressor and fan cycling issues but that is another issue. One of the times we had it at the dealership they found the return ducts in the den, the main area of the coach, had collapsed. They took 1/4" plywood and cut strips about 1 1/8 wide and maybe 2' or so long. One for each return. He put them into the duct turned flat so they would flex and go all the way in. He placed them in the middle of the duct and once it was all the way into the duct he turned it up on its edge which forced the duct open. One other thing, he cut the strips on a curve to match the curve of the roof. He actually took a piece of cardboard and made a template which took several tries to get it just right. He would hold it up against the ceiling and kept trimming on it until it matched the ceiling. Then he used the template to mark and cut the plywood strips. He also used plyers or channellocks to grasp the strips to turn them onto their edge. Works great.
Rex- is offline   Reply With Quote
Old 11-23-2017, 07:18 PM   #4
Texan
Montana Fan
 
Join Date: May 2017
Location: new caney
Posts: 322
M.O.C. #19873
Sounds like you have a dealer that doesn't mind thinking and doing outside of the box.
Texan is offline   Reply With Quote
Old 11-24-2017, 07:06 AM   #5
John Shasky
Established Member
 
Join Date: Feb 2011
Location: Tubac
Posts: 19
M.O.C. #11165
Thanks for the ideas. Will try the plywood idea!
John Shasky is offline   Reply With Quote
Old 11-24-2017, 07:38 AM   #6
happy camper x2
Seasoned Camper
 
Join Date: Jun 2017
Location: Bixby
Posts: 59
M.O.C. #20088
Same problem with our 2018 353 RL. Dealer installed 2 more returns added two new discharge ports. They matched the factory ones. Also used 1 1/2 pvc pipe to open up return and discharge plenums. We measured the distance of pvc needed cut to length and used a cap when pushing into place then removed the cap so no flow blockage. Wood might snag the insulation.

Actually works like it should.
Good Luck
__________________
Pete and Susan
2018 Montana 353 RL
2013 Dodge 2500
happy camper x2 is offline   Reply With Quote
Old 04-22-2018, 05:34 PM   #7
BUBBA-NONNIE
Established Member
 
Join Date: Mar 2017
Location: Bakersfield
Posts: 32
M.O.C. #19549
Happy Camper,
How long was the pvc? Did you install parrellel with the duct or perpendicular? How was it installed?
BUBBA-NONNIE is offline   Reply With Quote
Old 04-22-2018, 08:10 PM   #8
happy camper x2
Seasoned Camper
 
Join Date: Jun 2017
Location: Bixby
Posts: 59
M.O.C. #20088
parrallel to ducts had to play with the lengths to make fit
__________________
Pete and Susan
2018 Montana 353 RL
2013 Dodge 2500
happy camper x2 is offline   Reply With Quote
Old 04-22-2018, 09:24 PM   #9
BUBBA-NONNIE
Established Member
 
Join Date: Mar 2017
Location: Bakersfield
Posts: 32
M.O.C. #19549
Quote:
Originally Posted by happy camper x2 View Post
parrallel to ducts had to play with the lengths to make fit
Thank you. I have to get mine fixed before I leave in a week.
BUBBA-NONNIE is offline   Reply With Quote
Old 04-23-2018, 07:47 AM   #10
John Shasky
Established Member
 
Join Date: Feb 2011
Location: Tubac
Posts: 19
M.O.C. #11165
After 2 trips to Camping world and several weeks later: They replaced AC which had a coolant leak, however they tweaked it during the install and it didn't work when i brought it home. They had to order another AC unit and double up the gasket seal under it. It now works but I need to do something about the duct collapsing. I am thinking about putting spacers in the duct (not sure what kind) and maybe even adding two more intake vents or increasing the size of the existing vents.
John Shasky is offline   Reply With Quote
Old 04-23-2018, 08:18 PM   #11
Baldicon
Seasoned Camper
 
Join Date: Dec 2017
Location: Chattanooga
Posts: 69
M.O.C. #20906
Quote:
Originally Posted by happy camper x2 View Post
parrallel to ducts had to play with the lengths to make fit
What is the manufacture date of you camper? Montana was supposed to start installing redesigned ductwork sometime last fall that is not supposed to collapse.
Baldicon is offline   Reply With Quote
Old 04-24-2018, 03:28 PM   #12
Retire 2022
Seasoned Camper
 
Join Date: Jun 2017
Location: Burleson
Posts: 72
M.O.C. #20065
Beginning with what manufacture date would Montana's have the newer non-collapsible air conditioner ducting and return air ducts?
__________________
Doug and Suzanne: 2017 F350 CC 6.7L FX4 Dually
2017 Montana 3811ms Legacy Edition

Full Timing Since October 2017
Retire 2022 is offline   Reply With Quote
Old 04-24-2018, 03:39 PM   #13
Baldicon
Seasoned Camper
 
Join Date: Dec 2017
Location: Chattanooga
Posts: 69
M.O.C. #20906
Quote:
Originally Posted by Retire 2022 View Post
Beginning with what manufacture date would Montana's have the newer non-collapsible air conditioner ducting and return air ducts?
Not sure of exact date, but sometime fall 2017.
Baldicon is offline   Reply With Quote
Old 04-25-2018, 02:00 PM   #14
Mark Stueck
Established Member
 
Join Date: Aug 2016
Location: Longwood
Posts: 34
M.O.C. #18844
Send a message via AIM to Mark Stueck
ac return

I had a good service company repair mine took 4 tries but its working. they used 1 1/2 inch PVC about 2 inches long BUT they had to install it at the return air vent BOTH inside and in the AC unit. it forced the pipe to open all the way thru. they took pics through out the process and the iphone pics showed daylight at the end.
Mark Stueck is offline   Reply With Quote
Old 04-26-2018, 02:38 PM   #15
Denny and Angie Miller
Seasoned Camper
 
Denny and Angie Miller's Avatar
 
Join Date: May 2017
Location: Mid Missouri
Posts: 76
M.O.C. #19889
Quote:
Originally Posted by happy camper x2 View Post
Same problem with our 2018 353 RL. Dealer installed 2 more returns added two new discharge ports. They matched the factory ones. Also used 1 1/2 pvc pipe to open up return and discharge plenums. We measured the distance of pvc needed cut to length and used a cap when pushing into place then removed the cap so no flow blockage. Wood might snag the insulation.

Actually works like it should.
Good Luck
Do you have any pics you can share? Especially of the cap you used while installing the pvc?
__________________
2017 Montana High Country 353RL
2017 Silverado 3500HD DRW CC LB 6.6L Duramax
B&W Companion
Denny and Angie Miller is offline   Reply With Quote
Old 04-30-2018, 09:48 AM   #16
Mark Stueck
Established Member
 
Join Date: Aug 2016
Location: Longwood
Posts: 34
M.O.C. #18844
Send a message via AIM to Mark Stueck
No pics, the techs used their camera and showed me the pics before NO light.
after strong daylight. Denny do you ever make it to Mark Twain Landing, we spend the summer their. SITE 27
Mark Stueck is offline   Reply With Quote
Old 04-30-2018, 07:02 PM   #17
Denny and Angie Miller
Seasoned Camper
 
Denny and Angie Miller's Avatar
 
Join Date: May 2017
Location: Mid Missouri
Posts: 76
M.O.C. #19889
We stay at C.O.E Indian Creek campground several times a year...was just there last week
__________________
2017 Montana High Country 353RL
2017 Silverado 3500HD DRW CC LB 6.6L Duramax
B&W Companion
Denny and Angie Miller is offline   Reply With Quote
Reply

Tags
ac cycles, ac problem, collapsed return air duct

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Powered by vBadvanced CMPS v3.2.3

All times are GMT -6. The time now is 03:35 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.