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Old 03-27-2014, 04:46 PM   #1
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Holiday Rambler AC Duct work

Ladies and Gents,
I'm having issues with my AC not blowing cold air forcefully to where I can feel it when sitting under an open vent. When I do the AC test it's right at 20 degree difference. I suspect that because I can feel cold air in vicinity of the shower dome that I have a cracked duck or a leak somewhere in the system. I have been trying to find a schematic/blueprint of what it actually looks like under the roof vinyl before I try exposing it.
I'm wondering if anyone has had any expirience in dealing with this and how much of a pain in the butt it is. I don't have the original lighting housing that was installed when the coach was produced. The guy I bought it from ran LED lights from front to rear and glued up velcro stripes to hold light covers in place. Its a 38' 1993 HR Navigator spartan 300alli xsmn diesel pusher w/ 8.3 cummins. Thanks in advance for any help.
Andy-
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Old 03-27-2014, 05:00 PM   #2
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Not sure how yours run but on my 2006 HR Admiral the drivers side duct is cut for the shower skylight. The duct from the front AC ends at the bathroom vent and the rear AC duct ends at the bedroom vent right in front of the AC behind the bathroom. The passengers side duct runs the entire length of the coach. I ran a fish tape through all the ducts and pulled a sponge through when we purchased just to make sure they were all open and not full of stuff. (Did find some trash from construction).
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Old 03-27-2014, 05:03 PM   #3
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Quote:
Originally Posted by Androsyn View Post
Ladies and Gents,
I'm having issues with my AC not blowing cold air forcefully to where I can feel it when sitting under an open vent. When I do the AC test it's right at 20 degree difference. I suspect that because I can feel cold air in vicinity of the shower dome that I have a cracked duck or a leak somewhere in the system. I have been trying to find a schematic/blueprint of what it actually looks like under the roof vinyl before I try exposing it.
I'm wondering if anyone has had any expirience in dealing with this and how much of a pain in the butt it is. I don't have the original lighting housing that was installed when the coach was produced. The guy I bought it from ran LED lights from front to rear and glued up velcro stripes to hold light covers in place. Its a 38' 1993 HR Navigator spartan 300alli xsmn diesel pusher w/ 8.3 cummins. Thanks in advance for any help.
Andy-
Why don't you post some pics of your interior ceiling?

What A/C units do you have (make/model)?

In the meantime, have a look at this:

A/C Ductwork collapse and rehab

In my case, the lack of flow was caused by ductwork collapse at the airboxes. The ductwork that runs the length of the coach was fine.
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Old 03-27-2014, 05:07 PM   #4
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Yeah It's a coleman basement mounted AC. The ducting starts from the basement and works up behind the sink and stove fixtures and then i believe it just T's off at the ceiling. I will snap a few pics when I get home and post them up.
Andy-
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Old 03-27-2014, 05:13 PM   #5
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Originally Posted by Androsyn View Post
Yeah It's a coleman basement mounted AC. The ducting starts from the basement and works up behind the sink and stove fixtures and then i believe it just T's off at the ceiling. I will snap a few pics when I get home and post them up.
Andy-
Can't help you with basement A/C but the pics may be helpful.
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Old 03-27-2014, 05:30 PM   #6
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My Diplomat looked like the duct runs were made of duct board and ran all the way from front to back ( ac is in the ceiling ) I found a mouse had made a hole in it and plugged that with metal tape and a board. Was able to have a look with an inspection mirror and a flashlight after removing one of the vent covers. The biggest problem however was that the divider between the hot and cold decks had come loose and allowed the air to mix. Repaired that with more metal tape and seems ok now. One thing that surprised me was that both front and rear ac units feed into the same runs
Mike D
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