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I have a dometic duo-therm. No air coming through ducts.

\015 I have a dometic duo-therm. The unit works great and fan blows strong and both high and low work., but air is coming out of the ceiling unit rather than the duct work. The bedroom unit works OK, but the air is strong out of one duct, and not much comes out of the others. The front unit only has air coming out on the A/C unit and none out of the ducts.\015

Answers :

I have a new Montana Mountaineer with a Dometic Duo Therm as well and experience something similar.
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\015\012It appears that there are two options:
\015\0121. Open the vents in the unit and all the cold air will blow out of the AC as that would be the shortest path and the there is hardly any air coming out of the ducts.
\015\0122. Close the vents in the unit and it will force all the air through the ducts.
\015\012
\015\012We let the air blow straight out of the unit during the day and then force it through the ducts at night to force it in the bedrooms. You could also open the vents in the unit part ways to get a combination.
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\015\012I didn't figure it out immediatly either, but just look close at the unit and you can see that you can close the vents on the unit itself
Sounds like the ducting have come apart in some areas or blocked in some way. Take the supply grills off and with a shop vacuum try and reach as far as you can.

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