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#4782369 - 06/09/18 04:35 PM A/C condensate line not dripping
dishdude Offline


Registered: 11/14/08
Posts: 8732
Loc: Phoenix
I haven't noticed any water coming out of my condensate line for a week or two, and even though it's been dry I feel like there should be some discharge. The furnace and coil are in the attic and I don't want to climb up there. Can I try hooking my shop vac to the line outside and see if that works?

I feel like I could make something like this.

https://www.amazon.com/Diyvac-%C2%AE-DV4/dp/B01LYZ6REM/ref=sr_1_1?ie=UTF8&qid=1528579896&sr=8-1&keywords=diyvac
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#4782371 - 06/09/18 04:43 PM Re: A/C condensate line not dripping [Re: dishdude]
Eddie Offline


Registered: 12/07/03
Posts: 9559
Loc: Florida, Cape Coral
I take my garden hose and stick it into the drip line and push water up the line for maybe 1 full minute. You won't believe the stuff that come out. I do this 2X per year. Ed
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#4782374 - 06/09/18 04:45 PM Re: A/C condensate line not dripping [Re: dishdude]
Padawan Offline


Registered: 08/24/08
Posts: 333
Loc: NJ
If the primary drain is clogged and the system is generating condensate, you should eventually see it coming out of the secondary/emergency drain. If it was installed correctly, the emergency drain should intentionally be highly obvious when it's dripping.

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#4782378 - 06/09/18 04:55 PM Re: A/C condensate line not dripping [Re: dishdude]
Nick1994 Offline


Registered: 02/19/13
Posts: 10097
Loc: Phoenix, AZ
No humidity, mine doesn’t drip either.

I bought a new indoor/outdoor thermometer last week and it displays humidity percentage. 28% in my house and the outdoor just says “LL%” because it can’t read below 10%.

Here’s the Weather app


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#4782384 - 06/09/18 05:06 PM Re: A/C condensate line not dripping [Re: dishdude]
dishdude Offline


Registered: 11/14/08
Posts: 8732
Loc: Phoenix
I just tried using the hose from the shop vac and sealing it with my hand, nothing. I think it was sealing since you could hear the motor straining.

Nothing coming from the secondary drain, there's a huge pan under the unit that would catch any overflow and discharge from there. I also stuck a cheap little battery powered water alarm in the pan and haven't heard anything from it, but it might be dead since it's been up there 3 years.

Even though it's super dry, there's usually a drip. I would think that showering and cooking with boiling water would generate some indoor humidity.

Other than leaking out, is there any damage to the coil if water collects inside?
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#4782389 - 06/09/18 05:10 PM Re: A/C condensate line not dripping [Re: dishdude]
Fitter30 Offline


Registered: 05/05/13
Posts: 99
Loc: Peace valley, Missouri
At 5% Rh your car ac wouldn't drip. If the suction line is cold to the touch at outside unit it's ok. Suction line is the larger insulated line, smaller is the liquid line that runs warm to almost hot. With a thermometer 18* to 24* across the indoor coil is normal.

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#4782390 - 06/09/18 05:15 PM Re: A/C condensate line not dripping [Re: dishdude]
Delta Offline


Registered: 04/20/14
Posts: 1145
Loc: South Central PA
Originally Posted By: dishdude
I just tried using the hose from the shop vac and sealing it with my hand, nothing. I think it was sealing since you could hear the motor straining.

Nothing coming from the secondary drain, there's a huge pan under the unit that would catch any overflow and discharge from there. I also stuck a cheap little battery powered water alarm in the pan and haven't heard anything from it, but it might be dead since it's been up there 3 years.

Even though it's super dry, there's usually a drip. I would think that showering and cooking with boiling water would generate some indoor humidity.

Other than leaking out, is there any damage to the coil if water collects inside?


It's either sealing, or clogged possibly. Had that happen to my grandmothers house in Mississippi. Mold and gunk built up in the trap and water began to travel along the ceiling and into the hallway. The water had overflowed the pan under the unit. I had to crawl in the attic and cut out the old trap, but above the trap I put a threaded fitting on there so every spring I would put 1/2 a gallon of bleach through it. I know it sucks to crawl in the attic when it's hot, but it was necessary.
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#4782411 - 06/09/18 05:55 PM Re: A/C condensate line not dripping [Re: dishdude]
Al Offline


Registered: 06/08/02
Posts: 18033
Loc: Elizabethtown, Pa
Is it cooling?
What is the temp coming out of the vents?
What is the temp coming out of the outdoor unit vs air temp?


Edited by Al (06/09/18 05:57 PM)
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#4782420 - 06/09/18 06:14 PM Re: A/C condensate line not dripping [Re: dishdude]
philipp10 Offline


Registered: 05/09/14
Posts: 1171
Loc: Minnesota
it's 5% humidity in Phoenix. Even if the pan collected some, it would probably evaporate rather than collect.

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#4782430 - 06/09/18 06:27 PM Re: A/C condensate line not dripping [Re: Al]
dishdude Offline


Registered: 11/14/08
Posts: 8732
Loc: Phoenix
Originally Posted By: Al
Is it cooling?
What is the temp coming out of the vents?
What is the temp coming out of the outdoor unit vs air temp?


It's cooling just fine, I have the thermostat set at 73 and it's well over 100 outside. I just feel like it used to drip a bit, even in low humidity conditions.
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#4782432 - 06/09/18 06:32 PM Re: A/C condensate line not dripping [Re: dishdude]
Papa Bear Offline


Registered: 08/11/05
Posts: 7046
Loc: Leamington, ON, Canada ..... r...
Originally Posted By: dishdude
I don't want to climb up there.


Are you going to want to climb up there to replace the ceiling ?? ....
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#4782459 - 06/09/18 07:18 PM Re: A/C condensate line not dripping [Re: dishdude]
Warstud Offline


Registered: 09/02/05
Posts: 5390
Loc: MIchigan
I think if the condensate line was plugged up it wouldn't run.

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#4782472 - 06/09/18 07:44 PM Re: A/C condensate line not dripping [Re: dishdude]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
At 5 percent humidity it's not going to. Also it's not supposed to drip from the roof, the primary drain is usually one of the sinks in the house.
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#4782483 - 06/09/18 07:55 PM Re: A/C condensate line not dripping [Re: dishdude]
Eddie Offline


Registered: 12/07/03
Posts: 9559
Loc: Florida, Cape Coral
Just do the hose check I suggested above. That will prove there is no restriction. Ed
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#4782517 - 06/09/18 08:27 PM Re: A/C condensate line not dripping [Re: Warstud]
Dallas69 Offline


Registered: 02/11/14
Posts: 1661
Loc: Texas
When mine got clogged the backed up and leaked into the hallway.
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