Air Conditoner Vibration

[Mark_and_Linda]

My AC Air Conditioner had a vibration that I have been trying to isolate..last camping trip it about drove me nuts. I found the thread on this forum so I started trying to isolate it. I pulled the bottom cover off inside and tightened the mount bolts. They were loose, not the problem though. I climbed on top and took the cover off...checked everything and tightened the motor mounts. I still had a vibration so I checked the inside of the fan blade...nothing. I took off the other cover so I could see the front of the blade...there it was, a mud dauber had made him a home. I remember reading this on an earlier thread. Thought I would post for the new members...

[Mark_and_Linda]

Fulltimers wrote:
Unfortunately tightening the bolts inside was the wrong thing to do. They should be snug but NOT tight. What you did by tightening them is crush the gasket/seal between the AC and the roof. This may cause leaks.

Mine were not snug...three were loose.

[Fulltimers]

Unfortunately tightening the bolts inside was the wrong thing to do. They should be snug but NOT tight. What you did by tightening them is crush the gasket/seal between the AC and the roof. This may cause leaks.

[Mark_and_Linda]

I know next year...I will get on top, remove cover and do an inspection. I was thinking...how much would this have cost me if I had to take it to a RV repair? My DW had suggested this earlier, but I am the type to see what I can do first. Checking this forum is the best place to start....

[tvman44]

Mud dobbers are the #1 cause of vibration on these A/C units.

[the_bear_II]

Mine had a coating of crud on the blades which caused the vibration