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Topic: Noisy Roof A/C (Read 622 times) previous topic - next topic

Noisy Roof A/C

Roof A/C (Duo-Therm) unit is quiet when if first comes on, but after a while becomes quite noisy. I went up and pulled the cover off and took a video of where the noise is coming from.
https://youtu.be/ZM-yBh0Zwc0

Re: Noisy Roof A/C

Reply #1 –
Right now I have limited internet access so I can't watch the video. Looks like your compressor. I just added additional vibration isolation under the mounting bracket. It looked easier than replacing the existing rubber mounts.  A couple of them were hard to get to without disconnecting the plumbing.  Loosened the bolts, slid the material under and retighten the bolts.

The additional material significantly reduced the pounding noise when the compressor kicks in.

Rich

Re: Noisy Roof A/C

Reply #2 –
When listing to it I can't be sure but I just changed the rear fan motor mounts on my coach
and the old ones made a lot of noise. The way to find out if they are gone is to
lift the motor and if the motor lifts up that could be your problem.

Re: Noisy Roof A/C

Reply #3 –
Just was able to watch the video.  That is very loud.

Can you move the compressor and get the sound to stop/lessen?  Maybe pry with a big screwdriver under the compressor mount.  If so, more vibration dampening material will probably help.  If the noise is internal to the compressor, you may need a new A/C to fix the problem.

Rich

Re: Noisy Roof A/C

Reply #4 –
Old Guy,

Where did you get your motor mounts?  I am having the same issue.  My motor mounts from the side with rubber grommets, looks like grommets are worn out.
 

Re: Noisy Roof A/C

Reply #6 –
Thank you, that's exactly what I've been looking for!