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Old 05-28-2010, 12:11 PM   #1
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Air conditioner duct problem?

Hello All,

I purchased a 2000 Bounder a few months ago. Recently had the first chance to use the coach a/c system. This coach is equipped with two Coleman Mach a/c units with ductwork in the ceiling. There is very little air coming out of any of the ducts forward of the front a/c. I tried closing the rear vents, running both a/c's at the same time, etc. I just can't seem to get much air out of the front vents. Any ideas?
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Old 05-28-2010, 12:30 PM   #2
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On my 2004 national Tropi-Cal I had a similar problem. In my case the vents for both the black and grey water tanks passed through the plenum and were not sealed where they exited to the roof. A lot of my air conditioning was just being pumped outside. After removing the caps on the roof and sealing around the pipes my air works much better.
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Old 05-28-2010, 12:40 PM   #3
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I would have never thought to check for that. I will take a look. Anybody else have any ideas?
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Old 05-28-2010, 01:25 PM   #4
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Actually I only found it because I was trying to get rid of sewer odors in the coach and was installing cyclone vents on the vent pipes. Solved two problems at once since the odors were entering the plenum from the vent pipe and being blown through the motorhome.
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Old 07-08-2010, 09:33 AM   #5
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Still having problems after checking the vents. I have noticed that both the front and rear a/c's seem to push MUCH more air out the vents behind them (toward the back of the motorhome) than the vents located in front of each unit. In other words, with the front a/c on, I get very little air out of the vents in front of the unit (toward the driver's area) and good air all the way back to the rear of the coach. With the rear air on, I also get very little air out of the vents toward the front of the coach but it is fine toward the rear. I am wondering if this has something to do with the direction that the blower motors in the a/c units are pushing the air, since it occurs with both units. Is there some type of deflector which is located in the air handling unit of the a/c which is supposed to push the air forward as well as backward?
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Old 07-08-2010, 10:23 AM   #6
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What do you have for vents? These or disks that you pull down from vent opening.
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Old 07-08-2010, 10:37 AM   #7
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Mine is a Bounder, so it has the rectangular vents that run in two rows down the middle of the ceiling. They do have a slide that allows you to close off the vents, so I tried to close off the vents to the rear of the a/c unit, assuming that it would generate more airflow to the front of the unit, but it didn't make much difference.
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Old 07-08-2010, 03:48 PM   #8
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Pull the inside ceiling directional vents and check to make sure the foam/fabric filters are there. I had a problem with ours, same as yours, and it turned out being foam filters from the very front vent that had been lifted from the frame and blown back further down the line in the ductwork eventually becoming lodged. This must've happened a few times because I found 3 filters stuck in the ductwork about 1/2 way between the 1st and 2nd vent. I waited until dark and removed all the vents and filters and set a flashlight up in the ductwork at the rearmost vent to make sure the ductwork was clear of anything else. Those things get wadded up in a pile and start collecting dust and it doesnt take long to cut off most of the airflow
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Old 07-08-2010, 03:54 PM   #9
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I'll give that a try tonight. It is bad enough that I am afraid the front of the motorhome will be too warm when we are using the roof a/c's to supplement the chassis a/c while travelling. I am SURE that it will be too warm in the front when we are parked at the beach this year. Thanks for the advise.
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Old 07-08-2010, 06:10 PM   #10
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Just make sure you have/use your front windshield sunshade too. Ours drops the front temp in the coach by almost 15 degrees using the sunshade on the outside of the windshield.
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Old 07-08-2010, 08:24 PM   #11
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I figured it out! The way the system is set up, the blower motor blows the air straight down. Their is a set of ductwork that goes toward the back of the coach and a set that goes toward the front. Because the front ductwork has to go through the air intake, it is much smaller so as not to obstruct the flow of air into the a/c, thus, less airflow to the forward vents. I fixed it by cutting a piece of tin and screwing it to the inside of the a/c so that it diverts more air to the front ductwork and less to the rear. I did this to both a/c's. It has really evened out the airflow throughout the coach. Thanks for all of the ideas!
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Old 07-08-2010, 09:40 PM   #12
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Excellent news!
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