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  #1  
Old November 7th, 2021, 09:13 PM
Liquidlounge Liquidlounge is offline
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Leaky Lincoln (Water)

After checking out all the normal culprits for water intrusion, my drivers side floorboard is still giving me trench foot. Even light rain will make the back of the floor mats wet. My plan now is to remove the carpet and drive the car. Hopefully, I can get an idea of where the leak is coming from. If anyone has resolved a leak issue, please chime in. Maybe we can make this the definitive leak thread. I will keep you all updated until conclusion :.
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Old November 8th, 2021, 10:58 AM
W.V. Kelly W.V. Kelly is offline
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Have you elevated the car and inspected the floorboards from underneath? We'd be looking for dislodged grommets or open bolt holes or dings from that last offroad excursion. Checking the firewall would be another step. It could also be coming from above (windsheld seal, cowl vent, etc.).
If you get to the lifting the carpet stage this may sound too radical but put some water in the footwell and look underneath to see where it comes out.
W. V. Kelly
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Old November 8th, 2021, 05:28 PM
Liquidlounge Liquidlounge is offline
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Quote:
Originally Posted by W.V. Kelly View Post
Have you elevated the car and inspected the floorboards from underneath? We'd be looking for dislodged grommets or open bolt holes or dings from that last offroad excursion. Checking the firewall would be another step. It could also be coming from above (windsheld seal, cowl vent, etc.).
If you get to the lifting the carpet stage this may sound too radical but put some water in the footwell and look underneath to see where it comes out.
W. V. Kelly
The cowl vent fixed the leak on the passenger side about a year ago. I have a feeling you have owned a boat at some point with your last point haha. Works very well. I think removing the carpet is going to allow me zero in on the leak. My plan is to take a spray bottle and mist light cooking oil onto the floorboard then puff some baby powder on it. Hopefully there will be resultant water tracking leading me to the leak source. I have pretty much ruled out the windshield, sunroof and floorboard so far. Thanks as always for your insight Kelly
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Old November 8th, 2021, 07:42 PM
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Sunroof? how about the sunroof drains?
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Old November 15th, 2021, 10:41 AM
Liquidlounge Liquidlounge is offline
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I have pulled the carpet and temporarily taped up the sunroof with blue mask. Upon taking the hose to the windshield and cowl area, the floor remained dry. I hung it up for the day figuring it must be one of the front drain hoses in the sunroof channels (if there are actually hoses on them like the rear sunroof drains????). Well, that night it rains lightly and in the AM, I see the floorboards are wet!! The water appears to be coming in at the kick panel area So, the plot thickens here; not the sun roof, definitely not the windshield or cowl/wiper area. Any ideas?
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Old November 15th, 2021, 11:19 AM
W.V. Kelly W.V. Kelly is offline
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Try your blue tape trick on the upper door seal(s).
W. V. Kelly.
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Old November 15th, 2021, 12:26 PM
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will try, but will be surprised if its that, but hope I am surprised - you always give pretty solid advice Kelly. All of the door seals were recently removed and cleaned while trying to find this leak. The seals all appear to be in good condition. One thing for sure is that it would be very hard to track down a leak with the carpet still installed. On a side note, the carpet in these cars is a very nice setup with the molded foam and all - it would have to be in really bad shape before I would replace it with something aftermarket. Love this car, but this has been a major PIA!
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  #8  
Old November 16th, 2021, 11:51 AM
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My Marquis is leaking on the pass side. Didn't think to much of it until I was driving the other day and saw steam coming out of the defrost vent.

I don't think its the cowl because that was more of a issue on 98+ TC's. I know I had a leak on my 00.

I think the leak is at the evap drain on the firewall. The foam gets old and isn't as pliable.

Might want to check there. I going to check it when I fix my broken heater plenum door.
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Old December 1st, 2021, 04:13 PM
Liquidlounge Liquidlounge is offline
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Worked on the leak situation today with the hose and everything is dry as a bone. If the car sits out in the rain, I get a pretty good puddle on the driver's floor board....REALLY FRUSTRATING I can't replicate the leak with the hose. Just venting - I will let everyone know when I find the leak. Maybe I'll take the car to Line-X and have them spray the floor and maybe the whole outside!!
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Old December 1st, 2021, 07:24 PM
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When I was troubleshooting a similar issue with my 89, I ran a sprinkler on the whole car to replicate the issue. With mine, it turned out to be one of the sunroof drain hoses had come loose and slipped into the pillar. Good Luck!
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Old December 7th, 2021, 05:44 PM
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I have seen more than one leak from the hood release or parking brake cable where it goes through firewall.
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Old December 8th, 2021, 02:55 PM
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Quote:
Originally Posted by TobyU View Post
I have seen more than one leak from the hood release or parking brake cable where it goes through firewall.
Yes - I had a 2008 Grand Marquis that was a little damp on the drivers side floor, and it was when driving in really heavy rain it would come through the firewall where the cables are.

But nothing like the flood that comes through on the passenger side with the cowl vent repair (!)
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Old December 8th, 2021, 05:14 PM
Liquidlounge Liquidlounge is offline
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Thanks for the replies guys. I will closely check out the cables/wires coming through the firewall. Of course, it has not rained here in KC for ever, so I might be trying Newave's sprinkler method. Done with trying to replicate this with hose.
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Old January 6th, 2022, 12:21 AM
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Quote:
Originally Posted by Liquidlounge View Post
Thanks for the replies guys. I will closely check out the cables/wires coming through the firewall. Of course, it has not rained here in KC for ever, so I might be trying Newave's sprinkler method. Done with trying to replicate this with hose.
liquid lounge

any answers to your leak?
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Old January 6th, 2022, 10:56 AM
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liquid lounge

any answers to your leak?
No, nothing yet. I can't replicate the leak with the hose. It hasn't rained much here lately, but when it did, there was no leaking. I am going to wait a while to put the carpet back in, it's not terrible driving it without it. Being that it's not happening during colder weather made me consider that it might have been AC condensate, but there was zero evidence of that when I replaced the HVAC plenum recently and it looks nearly impossible for the condensate to migrate to the driver's side without flooding the passenger side also. My latest 2 hypothesis are: A) the door was ajar during heavy rain while parked. B) the car was parked in a position/angle that it's not normally parked in during rain and there was a perfect leak scenario where the water found it's way in somehow. In reality, I doubt that it will be either of these scenarios.
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Old January 25th, 2022, 09:58 PM
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Making progress. I was finally able to get it leak with the hose. I took off the nozzle and started covering the car with a heavier water stream. This time I was able to get leaks into both footwells. Both leaks must be coming from the firewall area. What makes the leaks so hard to locate is that the floor coming off the firewall is a double layer of steel that sandwiches a layer of sound deadener --I wasn't expecting that. The water runs under the top layer and out some weep holes where the floor starts to go horizontal, inside the car of course!. This double layering of steel starts high up on the firewall and at the top where it starts, it's covered with sound deadener/insulation. On the the passenger side it's obvious that the leak is from the often cited flapper drain gasket on the firewall (see PatrickBateman's attachment in this thread). The driver's side leak is not so obvious. Some of the sound deadener/insulation showed some evidence of being previously wet where the steering shaft goes through the firewall. It is surprising that much water even drains onto the firewall, let alone enough to leak inside of the car! So here is what I have done so far:
- I pulled back the front fender liners on both sides to expose the firewall. It's easy - just tuck the bottom of fender liner behind the brake rotor to keep it out of you way. It will be immediately obvious where all of these talked about incursion points are: The parking brake cable, the hood release cable, steering shaft, flapper valve, etc. I simply cleaned around all of the areas and proceeded to seal up with a tube of black polyurethane (I used Loc-tite PL400?) Most of this has to be done by applying to finger tip first, so be prepared for a bit of a mess. I am allowing the polyurethane to cure for a few days and will water test again and report back. If this works, this will have been an easy and inexpensive fix - stay tuned!
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Old January 25th, 2022, 11:13 PM
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water leaks are evil 🤣

i think you got it though !


my friends have a buick la crosse 2009 that had a leak that filled the spare tire well . 4 garages could not find it.

i looked on you tube and google . there is a small hole in the chassis rail under the bumper that gm covers with some type of tape that dries out and falls off , so the water that is supposed to drain from the tail lights goes another way . all gm had to was put a rubber plug they used tape . they even went to a dealer and they couldnt find it .

well i think you have it fixed
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Old January 26th, 2022, 11:46 AM
Liquidlounge Liquidlounge is offline
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If someone knows or could look; is your steering shaft seal (interior firewall) on top of the insulation or bolted directly to the firewall metal? It seems to me it should be the latter, but mine is not.
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