Middle AC on 3990 - Dutchmen Owners
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Old 07-25-2022, 03:05 PM   #1
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Join Date: Apr 2021
Location: Alvarado
Posts: 19
Texas
Middle AC on 3990

Has anyone experienced the middle AC not hardly blowing air out of the vents? I had to replace several parts on this AC and got it back together finally and this is the first time itís worked since I personally have owned it. So what it did before I do not know but what itís not doing now I do know and itís so bad Iíll bet it wouldnít blow a feather away hardly. The air has to be going somewhere so any thoughts or ideas I would greatly appreciate. Itís too hot this year for this here in north Texas and I need to get it fixed. Thank you in advance for any responses and help!
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Old 07-25-2022, 08:27 PM   #2
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If it's a ducted system (not direct)... then chances are your ductwork needs a good cleaning, and re-taping. Most of us experienced similar issues when new.

What's probably happening is that the bulk of your cold air is being directed into the cavity between the interior ceiling & the roof, due to shoddy workmanship at the factory. No only trash & debris inside the ductwork itself, but improperly taped outlets that allow the sir from the duct to escape into the cavity before reaching the vent.

This requires removing the interior vents, and then cleaning & re-taping all of your ducts. Also you'll probably want to climb up on the roof.. actually remove the AC unit, and then clean out the ductwork directly under the unit. Yes, it's a PITA chore... but many of us have found sawdust, clipped wire waste, and even soda cans in there.

Use the SEARCH button up above to bring up many previous posts on this subject, with instructions & photos of what probably needs done. Afterwards, and if it's not an issue with the AC unit itself, you'll be rewarded with MUCH BETTER airflow from your ceiling vents.
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Old 07-26-2022, 02:38 PM   #3
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Also, does you unit have the vent directly underneath that allows the unit to dump all the air straight below? If you open that and it blows cold and with force then Tim will know it is the ducts themselves.

In my 3305 it is a two unit system and they are cross ducted so you get stronger air flow near the units themselves but even if only one is on you can still feel slight air flow at the other end. For instance if I run the unit over the main room I can feel air coming out in the front bedroom, but not real strong. When I turn on the bedroom unit then it obviously is much better in the bedroom.
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