Water leak on the passenger side - Chevy Impala SS Forum
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post #1 of 19 (permalink) Old 06-27-2016, 01:35 PM Thread Starter
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Water leak on the passenger side

Hey Guys,

I've changed out my heater core and im still getting leaks. I'm thinking i need to replace the seal on the drip pan. Is that a part or can i use just a sealant?

Thanks
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post #2 of 19 (permalink) Old 06-27-2016, 02:04 PM
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If memory serves me correct, the base/lower piece of the heater core/evaporator cover has like a U-Shape to it where it mates to the upper half having a straight piece.

I had to play with that fitment about a half dozen times, 'till I figured out the evaporator core was shifted and the condensation was falling directly on that seam.

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post #3 of 19 (permalink) Old 06-27-2016, 02:26 PM
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Quote:
Originally Posted by monte17th View Post
Hey Guys,

I've changed out my heater core and im still getting leaks. I'm thinking i need to replace the seal on the drip pan. Is that a part or can i use just a sealant?

Thanks
No amount of seals or sealant will stop a leak due to a missing A/C Drain Elbow.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #4 of 19 (permalink) Old 06-27-2016, 02:56 PM Thread Starter
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Elbow isn't missing. I may need to just play with it some more. There was some type of seal around the cover.
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post #5 of 19 (permalink) Old 06-27-2016, 04:24 PM
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Quote:
Originally Posted by monte17th View Post
Hey Guys,

I've changed out my heater core and im still getting leaks. I'm thinking i need to replace the seal on the drip pan. Is that a part or can i use just a sealant?

Thanks
If you're talking about the black plastic cover in the car, I just used RTV and filled the entire channel.

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

Appears like this is what was done at the factory.

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post #6 of 19 (permalink) Old 06-28-2016, 08:35 AM Thread Starter
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Guys i found where it is leaking. Its not the seal that connects the upper and lower Heater Core housing. Its coming directly from the firewall where AC condensation drains.
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post #7 of 19 (permalink) Old 06-28-2016, 10:11 AM
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Impeded BEFORE it gets to the outside elbow?

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #8 of 19 (permalink) Old 06-28-2016, 11:26 AM
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Thinking the same thing. Make sure that the Port is not Clogged and also that the little elbow fits snug and that water is not seeping around it and findings its way back into the car.

Instead of the elbow, I replaced it with some old Heater Hose I had laying around. I plut a band Clamp on it so it wouldn't fall off. An added benefit is that the water doesn't drip all over the frame now and just drops to the ground away from the car.

Here is a pic of that hose under the AC lines. Little shorter than I wanted but all I had at the time and was an old faded 9C1 Heater Hose that was ***-colored anyway.


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'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #9 of 19 (permalink) Old 08-01-2016, 05:19 PM
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Quote:
Originally Posted by juniorwatson View Post
If memory serves me correct, the base/lower piece of the heater core/evaporator cover has like a U-Shape to it where it mates to the upper half having a straight piece.

I had to play with that fitment about a half dozen times, 'till I figured out the evaporator core was shifted and the condensation was falling directly on that seam.
Could you elaborate on the shifted evaporator core a little?

I am banging my head against the wall trying to figure out my water leak problem. It's not the usual missing elbow issue. It's not coolant. It's not rain water. I resealed the evaporator/heater core housing. The water appears to drip off the bottom of the foam backing that surrounds the hole that the drain pipe goes through in the firewall.

Thanks for any tips.
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post #10 of 19 (permalink) Old 08-01-2016, 05:59 PM
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I have had a persistent leak into the passenger's side foot well for years. I have tried everything. I have found a leak under the windshield, my door to body wire channel was loose at the door, and the seal over the cabin air intake was warped. I also found my antenna cable grommet was totally out of the hole. Check the flap at the end of the drain channel across the front of the firewall that goes under the cabin air intake hole. Make sure your door seals properly...a dollar bill should have resistance when removing it from between the door and seal with the door closed.


I have sealed everything conceivable on the firewall.


I also tried pressurizing the car with a small shopvac. I put the shop vac in the car, and made a "window" seal (wing window on a wagon), taped it to seal it, I also sealed the air inlet hole in the firewall, ran the suction hose, and wire through the seal, and started the vacuum from the outside. I sprayed the whole firewall area with "bubble liquid" from the dollar store. Wherever there are bubbles is a leak.


You can also try putting some new butyl caulk in the attachment channels for the top door seals (I do not think this is the cause, but it may be the reason my seatbelt gets wet in the rain...I can hear it dripping). Check behind the side windshield reveals for gaps in the urethane.


Roofing cement or sealant works good to seal things, and is cheap.

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