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BMC (Bluebird Motor Coach Unique Issues) If you have a unique issue with your BMC coach and it can't be answered in one of the other forums here, then this is where you can list it.....List your BMC Parts here too.

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  #1  
Old 05-29-2019
chokmah's Avatar
chokmah chokmah is offline
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Default BMC air conditioner seal and bolts

I would like to replace the seal between the roof air conditioners and the roof on my 1994 BMC 37. The rear one leaks under certain conditions. Typically there are four bolts holding the unit down. I can get to the front two bolts through the return air vent, but I can't figure out how to get to the rear bolts. I have tried tightening the front bolts, but it did not help. I have the "sort of" ducted version with a big flat cover over the unit with the return air vent and four directional vents in it. I can't figure out how to remove that to get to the unit. I figure that's what I need to do to get to the rear bolts.


Also, can the seal be replaced by just lifting the air conditioner up a little without need to completely disconnect everything? How do the drains connect? Do they just pull out and then slip back in? Does anyone have a picture of how everything looks on the inside?
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Jimmy and Sally Crossley
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1994 BMC 37 "SPARROW"
1996 Geo Tracker "Hummingbird" a.k.a. Hummer
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Old 05-29-2019
dthollis dthollis is online now
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The inside cover is held to the ceiling with "Christmas tree" fasteners. Pry on it and it should come loose. The drain isn't attached to the a/c unit, but is a funnel shaped cup with an air gap so when the drain gets plugged up the water will just drain onto the roof.
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David and Dawn Hollis. Sherman, IL

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1994 BMC37
1991 SP36(sold)
1984 FC35(totaled)
1978 FC33(sold)
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  #3  
Old 05-30-2019
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Thanks for the info. I can't hardly believe those fasteners are holding after 25 years! I hope I can pull them loose without breaking them.


After thinking about this some more, I don't think I have a reason to replace the seal after all. The drain line was leaking somewhere up in the ceiling, so I plugged the line and cut the Styrofoam right next to where the drains are so it would drain out on the roof. I am getting water coming down through the intake vent. I assumed the water on the roof was getting through the seal, but instead I think the problem is the water is just running down inside the seal somewhere. The best solution would be to fix the drain line. Maybe I can do that when I get it opened up.
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Jimmy and Sally Crossley
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1996 Geo Tracker "Hummingbird" a.k.a. Hummer
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Old 05-31-2019
toolmaker toolmaker is offline
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We also had a water leak thru the intake and last year had Leon replace the roof seal. When up there with covers off it was determined water had been getting into metal pan thru cracked covers and not draining out. Drilled some holes in front of lower metal pan and replaced all three ac covers. Roof seal was not the problem.
No leaks until last week when getting ready to head out for Shipsy. Seems that the thru the ceiling drain tube had separated. Not wanting to deal with that the day before our departure I removed the rubber cup and Eternabond taped the hole. Drains onto the roof now. Ok with that fix for now.
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Old 05-31-2019
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Jimmy, silly question but I got to know, dose yours leak only when the A/C is running, or when it's raining?
I too had a leaking AC, tuned out to be my drain tube like Dave and Paul Mentioned. Eternabond fixed me for now, fixing what could be a disconnected joint in the drain tube looks like a job that may not be worth doing.

Paul, how did your old A/C seal look when it was replaced, was it time or still in ok condition. I have been thinking about having mine replaced as a preventative to a soggy roof.
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Mansfield, Ohio
1995 BMC 37
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Old 05-31-2019
toolmaker toolmaker is offline
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The front two units had been leaking whenever it rained so I had been tightening up the bolts to try and stop that. Just a half turn at a time. So after a couple years of that they were squeezed down. Since we were at Shipshewana we replaced them both.
If you can get an appt with Leon it might be a good idea to get them changed out. And at that time give them a good cleaning and replace the top/cover seal.
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1996 BMC 40
fmca 200288
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  #7  
Old 05-31-2019
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The last time I was at Ships, I had the same problem of leaking A/C's, went to Leon and asked him what is the best he could do in stopping the water intrusion of the A/C's... He went up and looked, cleaned them out and checked the tubes... He said that they take too many 90* angles and after years of build up they clog, so he sealed up my drain holes and that has been 4 or 5 years and no leaks inside...
HTH
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Larry Dill & Barbara Ribar
Yuma, AZ. 85367
'95 37' BMC 'Pura Vida'
'84 35' FCSB SOLD
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Old 05-31-2019
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Could the drains be blown out occasionally with low pressure air from the bottom or would this not work?
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Tim Rees
Elida, Ohio
1995 BMC 37
F110660
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Old 05-31-2019
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I have no first hand experience beyond sealing off the drain mind you...
From the images I saw deep in the BMC forum there are a few 90 deg elbows in the bedroom AC, I was afraid Id blow them apart when trying to clean out. Id then have to drop the ceiling and cut the roof from the inside to get them back together again.. That is why I cut the grommet and sealed the roof.
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Mansfield, Ohio
1995 BMC 37
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  #10  
Old 05-31-2019
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Quote:
Originally Posted by Snowpig32 View Post
I have no first hand experience beyond sealing off the drain mind you...
From the images I saw deep in the BMC forum there are a few 90 deg elbows in the bedroom AC, I was afraid Id blow them apart when trying to clean out. Id then have to drop the ceiling and cut the roof from the inside to get them back together again.. That is why I cut the grommet and sealed the roof.
Hi Jim, we’re your drains stopped up? Mine still drain just fine, just wondering as long as they’re open, a little air through them once and a while might keep them open.
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