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Old 06-25-2022, 07:55 PM   #1
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2018 26' Flying Cloud
Fort Calhoun , NE
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Pinched A/C drain tube ...

The A/C condensate has been dripping from the roof instead of the drain by the tire. I disconnected it from the tee by the A/C and ran an endoscope down to see what was going on. Looks like it's pinched about 18" from the end.

Any ideas on how I might get it to open up?
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Old 06-25-2022, 08:43 PM   #2
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18" from the bottom or the top? If it's inaccessible, I would try to insert a stiff piece of tubing that is slightly smaller in diameter past the pinched section.
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Old 06-25-2022, 10:08 PM   #3
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You might try pushing up a section of the rigid tubing used to hook up water to refrigerators for the internal ice makers…
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Old 06-27-2022, 06:25 AM   #4
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JEWare: Good question ... my wording wasn't clear but the restriction is 18" from the end by the air conditioner. I took your (and n2916s's) suggestion of pushing a rigid tube (I used a piece of 1/4" pex tubing (from a water filter install)) and attempting to get it past the point. Even after deforming the end of the tube flat it wouldn't get past the restriction. I tried to reach the point from the other end (by the tire) but encountered more resistance (a bend or another pinch I don't know -- further than my endoscope can reach).

I might have to accept that I'll have A/C condensate running down the skin of the airstream.
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Old 06-27-2022, 06:49 AM   #5
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Get a piece of insulated copper wire 12 or 14 guage) and push it down the drain tube. You might try a few drops of dish soap on the end for lubrication. Could be a dead insect, random road debris, or a kink in the hose

Also try sucking or blowing air through the tube from the bottom. Use a tire inflater pump or a wet-dry vac. Partly open will work just fine.

Those damn drain hoses can be hard to access, although a long hard look at where the hose comes out will generally point you in a good way. Commonly the drain hose runs through the refrigerator wall or the closet wall. If you replace or repair the fridge, fix the drip hose too!
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Old 06-27-2022, 08:32 AM   #6
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I bought a 15' length of stranded 1/8" cable at Lowe's.
It's stiff enough to clear simple blockages, worth a try.
Recommended by KYD's expert friend Ray(?)
I put small heat shrink on the ends to prevent snags and fraying.
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