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Old 10-14-2016, 06:35 PM   #1
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Small rain-leak from the ac duct work

I'm sitting in my coach in a pouring rain in the Santa Cruz mountains and noticed a small drip coming out of the small round ceiling vent. It dripped for about 15 Minutes and stopped. The AC unit is about 12" from this round vent. I'm assuming that it is possibly that the rain is blowing up under the roof AC, and getting into the duct? Has anyone experienced this? Regards
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Old 10-14-2016, 07:51 PM   #2
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We experienced a similar situation in Kansas a few weeks ago. Down pour of about 5 inches of rain over abut 3 hrs. Came home to the vent closest to our 2nd AC unit slowly dripping on the floor. Popped off the vent cover and there were several tsp of water in the duct. Dried it out and did the same for the floor. So far no further reoccurance. Figured the rain was coming down so fast it may of back washed into the AC.
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Old 10-14-2016, 09:57 PM   #3
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seems like its time to replace the A/C units Gasket, Not that hard of a task. i think i may plan this for one of my next Maintenance job.

this guy covers it pretty detailed.
https://youtu.be/MMbboaRl1Nw
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Old 10-14-2016, 11:00 PM   #4
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Both of my AC have 4 nuts under the inside cover that hold the AC down and in place, both had about 1/2" play in all 7/16" nuts. Mine was a quick fix.
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Old 10-15-2016, 06:48 AM   #5
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Was the AC running? If so it could just be condensation from the high humidity.
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Old 10-15-2016, 06:51 AM   #6
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replace your the gasket between the roof and your AC unit. It has failed. Do it now, because the damage the water will do to the substructure will be very expensive to repair. Sadly, most leaks show up after many years of water damage are already done.
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Old 10-15-2016, 08:26 AM   #7
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Quote:
Originally Posted by lady puffin View Post
We experienced a similar situation in Kansas a few weeks ago. Down pour of about 5 inches of rain over abut 3 hrs. Came home to the vent closest to our 2nd AC unit slowly dripping on the floor. Popped off the vent cover and there were several tsp of water in the duct. Dried it out and did the same for the floor. So far no further reoccurance. Figured the rain was coming down so fast it may of back washed into the AC.
Thanks for the reply, I'm thinking the same thing, we got just a few drops and then it quit. I'm thinking that the rain must get under the A/C cover and make its way into the venting? Regards
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Old 10-15-2016, 08:29 AM   #8
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Thanks Sam, I could see that would be the case but it didn't leak around the A/C cover, but came out of the small ducted lovers. Regards
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Old 10-15-2016, 08:31 AM   #9
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Thanks 2- striker I'm going to look at this. Regards
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Old 10-15-2016, 08:32 AM   #10
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No it wasn't running. Thank you
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Old 10-15-2016, 08:36 AM   #11
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Lonfu; If the Gasket has failed wouldn't the rain becoming in around the AC vent cover? The issue I had was a little bit of the rain leaked from the duct work, out of the small round lovers. I'm thinking it somehow back washed into the AC unit and a little got into the ducting? It was probably a couple of TBS. full. Regards
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Old 10-15-2016, 08:39 AM   #12
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If it is coming out of the duct louveres and you are sitting at high altitude in 100% humidity, I would not rule out condensation rain. I have had that happen at 11,000 feet. Always the duct closest to the a/c unit. That said, I would still replace the ac gasket just in case.
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Old 10-15-2016, 09:00 AM   #13
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Thanks Dsallach; It was a warm storm but we are only 800 ft elevation. I think maybe changing the gasket would be the best. Regards
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Old 10-15-2016, 12:51 PM   #14
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I would tighten the AC gasket bolts and wait to see if the event reoccurs.
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