I noticed a fairly steady drip of cool or cold water coming out of my outside overflow drain in the eve of my house. Also, there is quite a bit of water collected on the ground. It has been quite hot outside and my A/C has been running quite a bit so I am not sure I really have anything to worry about.

Is your a/c in the attic? Is this overflow pipe the condensation drain for your A/C. If so you don't have anything to be concerned about. When warm, moist air is cooled condensation occurs. The pipe carries water to the outside.

Yes, my A/C is in the attic. Yes, I believe this is the drain for my A/C since the water is cold and not warm.

Hello, if this is the overflow drain that's dripping water then have a look and check to see if the condensate drain isn't plugged, some a/c units have a secondary line off a drip pan that is placed under the unit in case the drain gets plugged and the unit starts to leak water, just to be on the safe side I'd take a quick look and make sure that there isn't a problem with the unit.thanks----Zeke

Call your A/C service man.

Each A/C coil has 2 drain lines: First one is connected and drains to your sink somewhere in your house. Second one should be terminated somewhere on the outside where you can notice if it leaks.

You never see the first one to run, since it goes directly to the drain. But the other drain is a "warning" drain, telling you that Drip Pan under you coil is filled with water and that water is just about to overflow onto your ceiling.

I would post this question to A/C forum...

My overflow pipe continue dripping cool water. Even I turn off the AC for few days
I don't think it relates to my water heater since it locate other side of the house.
Any Idea what the overflow pipe come frrom?

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Originally Posted by ctrannql

My overflow pipe continue dripping cool water. even I turn off the AC for few days
I don't think it relates to my water heater since it locate other side of the house.
Any Idea what the overflow pipe come frrom?

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Hi ctrannql and Welcome to The Plumbing Page. At AskMeHelpDesk.com. You're responding to a 4 year old dead thread Look in then upper left hand corner of the first post form the date in the first post before you post, Thanks,
Sounds like you have a little gunk built up in the line that's causing the AC condensate to back up and dribble out. Blow the line clear with compressed air and then run bleach through it. Good luck, Tom

As I said I turned off the AC for few days. If it come from AC it should stop dripping, right? If I turn on the AC I notice the water drip from AC overflow pipe ( other pipe) as normal. There are 4 pipes come from 2 AC units and 1 comes from water heater. The 6th one drips water. I don't know where it come from.

[QUOTE][As I said I turned off the AC for few days. If it come from AC it should stop dripping, right?/QUOTE] Not if there's condensate backed up in the pipe. I said,

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Sounds like you have a little gunk built up in the line that's causing the AC condensate to back up and dribble out.

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What you're going to have to do is identify each pipe so you know its function.if you want to know what's dripping from where. Good luck, Tom

The overflow you are talking about is your secondary line which terminates above a window to indicate there is something wrong with unit. Your primary line on the unit is drained much lower to the ground than secondary on eve or into a sanitary drainage

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Each A/C coil has 2 drain lines: First one is connected and drains to your sink somewhere in your house. Second one should be terminated somewhere on the outside where you can notice if it leaks.

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Not in my area. There's a pan under the coils that collects the AC condensate and a 3/4" PVC drain that terminates outside. Running a second line to a sink would be both expensive and redundant. If this is written into code what's the reason. Comon Milo, educate me. Tom