"Newly formed interior pond" - Chevy Impala SS Forum
 
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post #1 of 10 (permalink) Old 09-28-2016, 08:51 PM Thread Starter
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Thumbs down "Newly formed interior pond"

Initially I was going to post this thread in the Heating/cooling section, after "diving" into the problem I thought different. For about the past four weeks I have occasionally smelt an odd odor when driving, my feet are clean! Odor seemed to disperse when the AC was running? This afternoon I decided to find the source. Checked under the driver's seat and nothing. As I leaned into the front passenger compartment I found it to be totally soaked, not damp, not wet but heavily soaked. I did replace the heater core on February 17, 2016 and replaced the AC compressor, accumulator, orifice tube and all O rings on August 15, 2016. It was about the time I changed the AC compressor that I first detected the smell. Initial thought the NOS AC Delco heater core I installed during February **** the bed prematurely.

Started by draining the radiator that seemed to be full as the overflow tank? Secondly I removed the front passenger seat, rear seat and disconnected the passenger seat belt mount from the floor. Lifted the soaked carpet and padding to find about 2" of water in the rear compartment, enough for a small fish pond!

This was without question water, not the orange colored Dex Cool thank God, don't need stains on this carpet. It was the very last NOS carpet GM had in 1995.

Tomorrow I plan on removing the lower passenger dash panels so I have an unobstructed view of the heater core and firewall area. I hope to have the wife's help, she can be in charge of the air hose. Directing a flow of air from the outside cowling and along the passenger firewall I hope to find the source of my new pond.

For sure I know the water is coming in at the firewall area because when I press on the padding that covers that area water drains out! This evening I vacuumed all the visible water out and have fans running all night.

Please chime in if you have any ideas or have experienced this problem!

I thank you very much for the time. God bless, Larry
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post #2 of 10 (permalink) Old 09-28-2016, 09:19 PM Thread Starter
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Question AC tray?

Just finished reading a fist full of threads regarding interior water leaks. From the passenger side it appears most problems have to do with the tray covering the Heater core and AC unit. Makes sense seeing I recently replaced the heater core. I will pull everything apart and check the situation out, going to take a week of Sundays for the carpet to dry!
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post #3 of 10 (permalink) Old 09-28-2016, 09:35 PM
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My car is an OCC. I have an ongoing leak issue similar to yours. I have been chasing it for about 6 years. I have had the front glass resealed, because the glass urethane had detached from the body on the passenger's side, and there was some rust under the urethane. I re-resealed it myself with roofing cement along the bottom on the passenger's side after the reseal, and sealed every possible crack and crevice on the firewall while I had the front end off for installation of the 454. Each time I seal everything I can find, I hope the water stops, and am disappointed. I still get a steady stream of water into the passenger's side of the car. It settles in the rear footwell, like yours.


Recently, I removed my carpet, and have painted the inside of the firewall, and some other areas with watercolor paint.


Last spring, I tried putting a small shop vac in the car. I sealed the suction hose and wire at a rear wing window, sealed the HVAC intake, and turned the vac on. Turning the HVAC fan on can accomplish the same result. I put bubble liquid from the local dollar store everywhere I could think of that might be a leak, and nothing...no bubbles. It still leaks. I also tried using a smoke bomb, and turning the HVAC fan on, and got smoke coming out of everywhere, including the door seals. I could not see specifically where the smoke was coming from, because it came out in large volumes from almost everywhere. If you used suction, you could put water on the outside, and it would suck into any leaks. It would be like testing the intake manifold for leaks with the engine running. Using different food color shades for different areas would tell you where the leak is.


The only area I can think of, that I did not seal are the sides of the front glass. I also did not put sealant in the groove of the top door seals that go over the pinch weld.


Another possible place for water intrusion is the door hinge attachment point. The "bolts" that hold the hinge are attached to a plate, and the holes are larger than the bolts, to allow for alignment. If the hinge is not tight against the body, or the holes are exposed at the top of the hinge, water could enter there...I just thought about that, and have not sealed that point.


I just replaced the vista glass two years ago, so I am reluctant to think that it is leaking.


I also have a small leak at the driver's side rear door, and my seatbelt gets wet at the top anchor. (this happens on both of my OCCs, and may be related to the missing sealant on the top door seal over the pinch weld)


My car is parked slightly nose up at this time. I do not know if that has any affect on leaks.


It just rained tonight, and I will check it tomorrow for runs in the paint. I can only hope that paint runs will lead me to the leak.


Hopefully these ideas will help you find your leak.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #4 of 10 (permalink) Old 09-29-2016, 07:05 AM Thread Starter
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I am praying and leaning towards the pan located under the passenger side of the vehicle. I changed the heater core February 17th or about, NO PROBLEMS. Car set most of winter months. When I did use the AC it **** the bed so I installed a new one. Believe this is when the leak started!

Without question the water is coming down the interior firewall on the passenger side only. Vehicle does not ever sit outside, parked level and majority of all roads here in coastal NC are flat as a dog turd!

This morning I checked the progress of drying, doing pretty good, another couple of days with the fans. Tonight I will start removing the pan so I can check out what I might have done wrong when installing.

Larry
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post #5 of 10 (permalink) Old 09-29-2016, 07:21 AM Thread Starter
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Question for Fred!

Fred, on a hunch I searched for more information on the interior AC pan that has the "drain tube and elbow". Just went down and checked my SS out and at the firewall I can see the tube that comes out of the firewall. Problem is that it's flush with the firewall, THERE IS NO DOWNWARD ELBOW?

When I replaced the heater core in February I did not know of the elbow on the other side of the firewall and must have pulled the pan off allowing the elbow to fall off!

Also, did not check any foam gasket nor did I add any silicone for potential leaks.

I am getting a clearer picture of the problem.

QUESTION Fred, do you have an elbow for the pan?

Larry
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post #6 of 10 (permalink) Old 09-29-2016, 07:24 AM
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Make sure you put the elbow on the drain tube. If the elbow is missing, you will get water in the car.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #7 of 10 (permalink) Old 09-29-2016, 07:33 AM
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You posted while I was writing.


If you are anal about stock, have a couple of the elbows. You can also use any 5/8 inch rubber elbow, or put a piece of hose on it, and feed the end toward the bottom of the car.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #8 of 10 (permalink) Old 09-29-2016, 07:45 AM Thread Starter
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Stock elbow!

Fred, there is NO ELBOW on mine! I now know I had to loose it when removing the tray. I would really like one if you have an extra. I will then add an extra length of tubing to the factory elbow. Your a God send!

I will send you an email.

Larry
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post #9 of 10 (permalink) Old 09-29-2016, 12:02 PM
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As Fred Mentioned, you could likely just use some hose with a 90* bend to it. The elbow may still be available at the dealer but it allows water to drip right on the frame. I just used an old section of heater hose and put a Band Clamp on it to help keep it attached.

Check this thread and in the last post is a picture of what I used. It also mentiones what you need to use if you happen to remove the AirBox cover again and want to replace the gasket in the channel.

https://www.impalassforum.com/vBullet...-fw-seals.html

GL

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post #10 of 10 (permalink) Old 09-29-2016, 03:59 PM Thread Starter
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Thumbs up Thank You!

4DoorSS, my thanks for chiming in and the advise. Fred has an elbow on it's way, I will also add a downspout to keep the water of the frame. Today I purchased a tube of black silicone that I will remove the cover and add as a gasket.

During the late 90s, the heater core was first replaced by a dealership in Mass. This explained why 3 screws were missing as well as no gasket. Still didn't leak though!

The carpet is pulled up and being dried with the use of a fan.

I did not know of the elbow so I am sure this problem is my fault. When I replaced the heater core I am sure it fell of as I pull the pan off!

Larry
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