Question about Dometic Rooftop RV Air Conditioner

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Loud Noise The Duo-Therm roof mount a/c 559 series unit on my 1981 Avion TT makes a very loud noise when running. Somewhat of a vibration or unbalanced type of noise. Any suggestions as to how to repair it? Thanks

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  • 3fishnet Aug 02, 2008

    Comment by ginko, posted on Aug 02, 2008
    If you want to DIY you will have to individuate the noise source, take apart the unit and replace fan, to get replacements contact

    I have only owned this tt for about 1 year and have never taken the hood off the a/c unit on top of tt. How do I individuate the noise source from the "unit" or the "compressor"? How difficult is it to replace the fan bearings?
    Is this unit supposed to run continually when turn on are is there a thermostat inside to turn it off and on?

  • 3fishnet Aug 05, 2008

    My tt/rv refrigerator is a non-defrost type. Lately, I have had to defrost the freezer section but not the refrigerator. What is going on?

    Thanks,

    Lonnie Davis

  • 3fishnet Aug 05, 2008

    I have only owned this tt for about 1 year and have never taken the hood off the a/c unit on top of tt.

    How do I individuate the noise source from the "unit" or the "compressor"?

    How difficult is it to replace the fan bearings?

    Is this unit supposed to run continually when turn on are is there a thermostat inside to turn it off and on?

  • 3fishnet Aug 16, 2008

    The trailer is located in an area that would be almost impossible to get a repairman to come to repair it. The trailer is not moveable, so I want to repair it my self or take it apart and take it to someone to fix it.
    How do I individuate the noise source from the "unit" or the "compressor"?

    Are there speical tools required to take the unit/fan/whatever apart to repair?

    How difficult is it to replace the fan bearings?

    Is this unit supposed to run continually when turn on or is there a thermostat inside to turn it off and on?

  • 3fishnet Aug 16, 2008

    Ok, sounds good...but how difficult is determining if it's the fan bearing and how difficult is it to remove and replace the bearing? Is this something I can do or do I need to take it to someone with speical tools/knowledge?

  • 3fishnet Aug 19, 2008

    Why is it no one answers all of my questions? Such as:

    1. How difficult is it to take the a/c unit apart and determine if it is the fan bearings going bad causing the noise?

    2. How difficult is it to repair/replace the fan bearings?

    3. Is this something I can do with regular tools or will it take specialized tools?

    4. Would it be better to take it apart and take it to an A/C repair shop?

    Thanks,

    ltd

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Check the mounting gasket. Make sure they are tightly screwed on. Installing 2nd gasket can also be done.

Posted on Aug 16, 2008

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I think the fan bearing got damaged ,so check that ,if it damaged or not in good condition then replace that

Posted on Aug 16, 2008

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Yes obiviouslyl.

Posted on Aug 14, 2008

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  • Dometic Master
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Check if noise comes from compressor or from the unit . If it is from the unit is probably a fan bearing in need of replacement.
Check last pages of your manuals for service repair phone number.

Posted on Aug 02, 2008

  • Ginko
    Ginko Aug 02, 2008

    If you want to DIY you will have to individuate the noise source, take apart the unit and replace fan, to get replacements contact

    Dometic

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