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AC not draining condensation properly

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Old Jul 9, 2018 | 10:15 PM
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Default AC not draining condensation properly

Hey guys new to owning a vette. Have an 02 coupe. My AC is putting water into the cabin, looked at threads about cleaning the drain tubes (uders), passenger side tube is clean, driver side were clogged up and I cleaned them out, but everything on all tubes was dry as a bone as well as the boxes they connect to. The blower motor had a half pint of water in it, and every time I make a right turn water runs all over my foot at the gas pedal. I pulled the cowl cover but didn't see much there.
Is there something I am missing here? Anything else to check? Hoping I don't need to start pulling the dash apart at this point.
Any help greatly appreciated.
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Old Jul 9, 2018 | 10:30 PM
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When you say the udders are dry, they are for rain in the cowl.
You need to get to the air box drain tube under the air box. Check you tube
to see the a/c drain r&r. It is located to the rear of the battery. Easiest is to
get under the car. Good luck.
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Old Jul 9, 2018 | 10:42 PM
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Originally Posted by jaki30
When you say the udders are dry, they are for rain in the cowl.
You need to get to the air box drain tube under the air box. Check you tube
to see the a/c drain r&r. It is located to the rear of the battery. Easiest is to
get under the car. Good luck.
Thanks I will check it out
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Old Jul 10, 2018 | 09:37 AM
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Originally Posted by Randryracer

Thanks I will check it out
Randy,

It happened to me as well after a short 200 miles trip. I found the tube that was directly behind the passenger fuel rail side firewall from under the car you will see a black tube that is 90* bent with a small nipple (keep the mouse out) on the end, just stick a cloth hanger in the that nipple end and you should get all kind of water coming out if that is the problem, I got all wet from laying directly underneath of the drain tube with all that condensation pouring out, so just be warn. BTW you will need a strong light to see or just look for a trail of water stain on the frame. Good luck.
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Old Jul 10, 2018 | 09:43 AM
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Originally Posted by Randryracer
Hey guys new to owning a vette. Have an 02 coupe. My AC is putting water into the cabin, looked at threads about cleaning the drain tubes (uders), passenger side tube is clean, driver side were clogged up and I cleaned them out, but everything on all tubes was dry as a bone as well as the boxes they connect to. The blower motor had a half pint of water in it, and every time I make a right turn water runs all over my foot at the gas pedal. I pulled the cowl cover but didn't see much there.
Is there something I am missing here? Anything else to check? Hoping I don't need to start pulling the dash apart at this point.
Any help greatly appreciated.
So I checked the AC drain tube behind the right cylinder on the firewall, it is not plugged up, it is open. Now what ? Do I try sticking something into the opening? This is not giving me a warm fuzzy feeling.
Any ideas or help Please
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Old Jul 10, 2018 | 10:47 AM
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Originally Posted by Randryracer
So I checked the AC drain tube behind the right cylinder on the firewall, it is not plugged up, it is open. Now what ? Do I try sticking something into the opening? This is not giving me a warm fuzzy feeling.
Any ideas or help Please
i wasnt aware of that opening.....or maybe its the same one.....i found my ac drainage tube when i removed the passenger side wheel well access panel to clean the passenger side udder. jack the car up , wheel can stay on and remove the access panel between the wheel and passenger door there is several hex screws on the bottom and one is hiding that goes into the fender. with this removed (if its stuck look for a screw you missed) you will see the drain tube 1/2 OD 1/4 ID exiting the fire wall . try vacuming it out instead of pushing something in. good luck. and let me know if its the same one.

Last edited by bobs77vet; Jul 10, 2018 at 10:48 AM.
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Old Jul 10, 2018 | 01:37 PM
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Originally Posted by Randryracer
So I checked the AC drain tube behind the right cylinder on the firewall, it is not plugged up, it is open. Now what ? Do I try sticking something into the opening? This is not giving me a warm fuzzy feeling.
Any ideas or help Please

Randy,

don't have to remove anything. Just make sure your have good support when you jack the car up.

just looked up and when you find the tube, go ahead and stick a wire or clothes hanger up to it. Maybe something is stuck up in the tube and that is why it looks dry.

If if you are getting water inside the passenger side from condensation. It is full of water inside the fan house and it may drip down to your electronic if you don't drain that real quick.

Even f the drain tube looks dry, I would still dry to stick something n and make sure it is not clogged up inside, while you are down under the car anyway


Last edited by Skyhawk23; Jul 10, 2018 at 01:38 PM.
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Old Jul 10, 2018 | 04:06 PM
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Originally Posted by Skyhawk23



Randy,

don't have to remove anything. Just make sure your have good support when you jack the car up.
that may be very true...I never looked for it specifically, but saw it when i removed the access panel looking for the bottom of the passenger udder....so i am not sure when it was actually visible, sorry if i mislead bob
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Old Jul 13, 2018 | 08:33 AM
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Originally Posted by Randryracer

Thanks I will check it out
I would like to Thank all for the input. I pulled the blower motor and got a half pint of water out of it. I did pull the AC drain tube, it was free of debris. I used a piece of TIG wire and put a small hook on it and ran it into the drain tube coming out of the firewall. When doing so some water ran out. Going in about 6" and doing this several times, no debris was present. My next question is, what does that cavity look like inside? Tubing channel? A larger capture/holding area inside the fire wall. I have left the drain tube off for now, every few days running the wire in there, but still seeing no debris. I am tempted to blow air (maybe 30 psi not getting crazy) in there to see the affect, would this do any harm. It was a Florida car that sat outside for a long period of time, I have been finding a lot of small leaves everywhere, wondering if they could make there way into this cavity?
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Old Jul 13, 2018 | 11:42 AM
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I couldn't reach up far enough to pull the drain tube out of the housing. I may have needed to have the car jacked up higher.
That said, I am not sure how you can get anything into the housing if you manage to remove the drain tube. There is no room to work to get into the housing itself. As a point of interest, I removed the battery and pulled the Udder out of the housing end and found a mouse nest inside the housing. I pulled out as much material as I could. Not sure what may be left as I can't 'feel' anything further than my finger tips away from the opening.

Last edited by jaki30; Jul 13, 2018 at 11:43 AM.
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Old Jul 13, 2018 | 01:39 PM
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I had to remove my AC drain and run a thin wire into it to clear the obstruction. About 2 quarts of fine H2O came out and in a hurry. BTW, when I pulled the rubber drain out, it fell on top of the tunnel plate, never to be seen from again. I have yet to replace it. Should I leave it open, or buy one and get it back in there?
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Old Jul 13, 2018 | 01:40 PM
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Originally Posted by Randryracer
I would like to Thank all for the input. I pulled the blower motor and got a half pint of water out of it. I did pull the AC drain tube, it was free of debris. I used a piece of TIG wire and put a small hook on it and ran it into the drain tube coming out of the firewall. When doing so some water ran out. Going in about 6" and doing this several times, no debris was present. My next question is, what does that cavity look like inside? Tubing channel? A larger capture/holding area inside the fire wall. I have left the drain tube off for now, every few days running the wire in there, but still seeing no debris. I am tempted to blow air (maybe 30 psi not getting crazy) in there to see the affect, would this do any harm. It was a Florida car that sat outside for a long period of time, I have been finding a lot of small leaves everywhere, wondering if they could make there way into this cavity?
You need to run a wire into the drain, on the firewall. It's still plugged, guarantee it.
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Old Jul 13, 2018 | 02:34 PM
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Originally Posted by 8VETTE7
The original rubber tube that turned 90 degrees down that was on the car served basically to keep small creatures from crawling into the tray the condenser sits in. You have to decide if not having the tube is a consideration for your situation or not.
I'm not sure I can get it back up in there. Talk about tight spots. I'm going to leave it off and hope for the best.
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Old Jul 13, 2018 | 02:39 PM
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Originally Posted by 8VETTE7
Here are a couple pics from the shop manual of the tray that the AC Condenser sits in:







In the first pic above the condenser is the top diagram, the condenser sitting in the tray is the center diagram. The fan squirrel cage is seen to the left pointing up and the drain for the tray is pointing straight out at the bottom center of the diagram.. The bottom diagram in the first pic shows the interior of the cavity that the condenser sits in but unfortunately they turned the diagram 180 degrees from the center one. You can however see the hole where the fan and squirrel cage mount.

2nd pic top diagram shows the cover that goes over the whole assembly.

What ever you use to push into the drain tube you need to be careful NOT to puncture the condenser. It looks as though you MIGHT be able to feel what, if anything, is blocking the drain tube by getting a small hand up through the opening where the squirrel cage mounts and feel around. Have never tried this as my hands look like a catchers mitt.......
Thanks for the diagram, now I am glad I didn't start ramming the wire in hard, just went in until it stopped. The squirrel cage accesmay be the best way, I wish I would have investigated more when I had it out to drain the water out of it.
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Old Jul 13, 2018 | 02:47 PM
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I was unable to get the drain clear through the bird cage. I had to go under the car. It is not a fun job. Get the car up as high as you can.
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