Question about Dometic Rooftop RV Air Conditioner

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I have a Duo Therm RV air conditioner probably put in when RV was made in about 1989. Started leaking through the ceiling last year down onto my floor, so I kept it off for a while. I would only try it now and then, but when I switched on the ac the fan intermittently would not come on at all. Eventually it quit altogether. However, just now I turned on the fan and ac to check it out. The fan is now working very well at all speeds...I don't know how long it will though...? It is a bit cool right now outside, so I won't be able to see if the compressor comes on, but I want to ask what I need to do to check out the problem of it leaking when compressor is on and why the fan doesn't come on at times even though I can hear the motor. Hope you can help. I will sure be needing the ac here where I live. Appreciate your thoughts and suggestions for troubleshooting. Thank you.

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  • conjeaniel Feb 28, 2009

    Thanks, Farfield, for your response to my question. I turned my ac on the other day when it got to be 91 degrees inside the RV and it worked properly all day and without leaks. Fan...compressor...everthing worked fine. Thanks for the reminder about looking for oil hole. I'd forgotten about that. And I will check out the fins and and coils. I checked the outside, but not the inside, so I'll do that too.



    Very helpful!



  • conjeaniel Mar 02, 2009

    Farfield, I did write a rating. I'm sorry it did not go through. I gave you the blue 4 for excellent suggestions. Maybe you received my last post to you also, but then I don't see it here either so that might not have gone through. Might want the site tech to check out why neither of these were sent.



    My ac is working top notch now.



    Thanks for you excellent suggestions.

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I need more information. And if you have worked on AC's before? Thes main things to check I believ is the fan motor I just wrote out a long explanation as to what to check and look for and I think it got lost. SO I believe your hearign the compressor continue to run even when the fan stops. 
Eventually the compressor over heats and stops. this is when nothig runs. Here is where I believe te indoor coil has been covered with Ice-frost and when the compressor stops the ICE FROST melts and you get water on your floor. 
The motor could be bad or the run capicator  I also believe your indoor coil (and most likely the outdoor one too) is plugged up or dirty. A dirty outdoor coil is the most often cause of motor over heating and or capicator failure. If you can look through the fins of the outdoor and indoor coil ALL OVER then they are clean. Any area stopped up over 20% and you need to wash them out.
Take your capicator out and have it checke by someone with a capicator checker. They will most likely have a replacement if needed. Check the "STIFFNESS" of the motor bearings. If you spin it and it turns over 2 or 3 times or more the bearings are probably ok.  If it has oil holes add about 20 to 40 drops lite machine oil to the bearings. If they are sealed... Start looking for a repairman or take care if your goin to change it yourself. Too many factors to go into here about changing a motor. And some may or maynot apply.
Hope this helps you if I need to more clear get back to me and well discuss it more. GOOD LUCK!

Posted on Feb 28, 2009

  • Farley Redfield
    Farley Redfield Mar 02, 2009

    I'd like to be able to ask this person to please rate my response to their problem and grade me accordingly. Otherwise I feel like I'm wasting my time. Thanks for getting back to me.

  • Farley Redfield
    Farley Redfield Mar 03, 2009

    OK ty for your rsvp to my request. AND GOOD LUCK.

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