RV AC

[Cmess]

My Dometic AC seems to be cooling just fine but has started making a humming noise that seems to be louder inside than outside. Not sure what to check here?

[MNtundraRet]

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@Cmess wrote:

My Dometic AC seems to be cooling just fine but has started making a humming noise that seems to be louder inside than outside. Not sure what to check here?

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More than likely the may be a loose support around the compressor on the roof. Might be inside section of the unit. 

[Cmess]

It only happens when the compressor kicks on. When it cuts off before the fan shuts off the humming stops.