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Old 09-27-2016, 08:04 PM   #1
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mud daubers

Cranked up my AC units after being in storage over the summer, and the rear unit sounded just awful - like a bearing going bad.

While I was washing the roof, I hosed down the units and saw a bunch of sand running out of the rear AC unit, and knew what the problem was.

Mud daubers in the the fan rotor!

Also discovered a bunch of dead insects, spiders, and really clogged coils which got rinsed from the inside out. So I've added yet one more task to the annual maintenance list...

So if your AC ever sounds really bad, now you know!

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Old 09-27-2016, 08:28 PM   #2
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They do love the freshwater vent tube also. I pack mine with a piece of plastic screen wire.
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Old 09-28-2016, 02:40 PM   #3
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One fine day I was outside and watched mud dobber flying in and out of my engine air filter input, didn't like that so got some magnetic floor vent covers and cut to size to cover the air intake. Now I do also cover my ignition switch with a sign to remind me to remove before starting engine, but now no more nests in the engine intake, scary to me.
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Old 09-28-2016, 02:59 PM   #4
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They like your furnace vents too - they make screens that cover these vents - you might want to invest in some


Also for our A/C, we took the covers off and lined the vents with screen door mesh and secured it to the inside with Gorilla Tape
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Old 09-28-2016, 05:46 PM   #5
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We had a mud dauber build a nest on one of the A/C fan blades while our fifth wheel was sitting at the storage lot for a few weeks. It threw the balance of the fan off so badly that when I turned on the A/C the entire fifth wheel started shaking. That was a “what the hell” moment.

The nest was well hidden on the backside of the fan blade so I didn’t find it right away. Once I found it I kept spraying it with water until the nest turned back into mud and scraped it off with my fingernail. Working on the roof in the middle of summer…not fun.
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Old 09-28-2016, 06:22 PM   #6
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Quote:
Originally Posted by Oakman View Post
We had a mud dauber build a nest on one of the A/C fan blades while our fifth wheel was sitting at the storage lot for a few weeks. It threw the balance of the fan off so badly that when I turned on the A/C the entire fifth wheel started shaking. That was a “what the hell” moment.

The nest was well hidden on the backside of the fan blade so I didn’t find it right away. Once I found it I kept spraying it with water until the nest turned back into mud and scraped it off with my fingernail. Working on the roof in the middle of summer…not fun.
Had the same thing happen 3 or 4 yrs ago. It was 90° out and I ended up having to take the blade off and cleaning. We were in FL at the time. When I got home, I removed the cover and covered the entire area between the compressor and the condenser with screen wire. NO MO MUD DAUBERS.
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Old 09-28-2016, 06:59 PM   #7
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Same thing earlier this year. Was checking everything out before leaving on a trip. Ac wouldn't run. Found a nest big enough it wouldn't let the fan run. Luckily the thermal overloads worked and didn't burn the compressor/fan motor up.
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