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Mercury Grand Marquis Water Leaks

42 messages,  Last post on Jul 21, 2009 at 8:12 AM

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What is this discussion about? Mercury Grand Marquis, Auto Body, Auto Repair, Sedan

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#38 of 42 Re: Reply to Merc water leak [jsylvester] by cobrass Oct 22, 2008 (5:25 pm)
Replying to: jsylvester (Oct 23, 2007 8:19 pm) Just Bought 96 Grand Marquis Has 166,000 Km In a very good shape. I found that the pass.side floor is wet, so I thought they had cleaned the car before selling it to me and this part was still wet so I dried it by putting clothes under the mat and I would change to a dry clothe every couple of days. So far It's drying up, but I'm afraid It's a start leak even though it rained lightly for a whole 2 days and It's only damp a bit.   It took a whole gallon of a premixed coolant before it stopped losing some (Level).   Other than that I'm very much enjoying my new ride.   Sam, Replies to this message: ralka (Nov 01, 2008 4:40 pm)
#39 of 42 Re: Reply to Merc water leak [cobrass] by ralka Nov 01, 2008 (4:40 pm)
Replying to: cobrass (Oct 22, 2008 5:25 pm) pull the carpet back on the right front floor and run water over the windshield. than look to see if water is coming out of the bottom of the hvac or to the side of the case, or from higher
#40 of 42 Re: Reply to Merc water leak [vernes97] by cougar6999 Jan 12, 2009 (5:08 pm)
Replying to: vernes97 (Oct 27, 2007 12:31 pm) I have a 97 Crown vic that leaks on both sides. I performed the seal the hell out of the fresh air intake and had no luck.   I pulled out the carpet and loosened the sound deadner on the firewall and had the wife start running the hose. I found the leak on the drivers side was coming from the grommet on the hood release cable that passes thru the firewall. It was cracked.   The passenger side was the grommet on the round bundle of wires that runs thru the firewall right under the heater box. The grommet is the larger one, about 1.5 - 2 inches in diameter and has a bunch of wires going thru it. It looks like it either shrunk or it wasn't spec'd right from the factory. What a pain to find. Hope this help some folks. Good luck. Replies to this message: felhet (Apr 08, 2009 2:27 pm)
#41 of 42 Re: Reply to Merc water leak [cougar6999] by felhet Apr 08, 2009 (2:27 pm)
Replying to: cougar6999 (Jan 12, 2009 5:08 pm) I never had a problem with my 96 until I moved to Texas and experienced the torrential rains there.   I read the posts on this site and decided to investigate myself. I used to have PUDDLES on both driver and passenger sides in the front and back.   I ended up removing the plastic cowl cover under the windshield and then the wiper tray which holds the wiper motor and the wiper mechanism. You have to take off the wiper arms themselves to do this.   The wiper tray has channels for water to run and in the middle there is a plastic/rubber flap for the water to collect and drip down a "chute" down the middle of the engine bay and firewall. My wiper tray was COMPLETELY clogged with dirt and leaves at the mouth of the rubber flap. I vacuumed all the dirt out and cleaned all the little crevices and replaced the wiper tray.   I also siliconed the heck out of the fresh air intake on the passenger side since the gasket shrunk like everyone else. And I siliconed the heck out of the cables going through the driver's side firewall.   So far I have had NO problems. I did all this 8 months ago and we have had some hard rains since then.   Hope this information helps. Let me know if there are any questions.
#42 of 42 2003 Mercury Grand Marquis water leak by cathiew Jul 21, 2009 (8:12 am)
I have a water leak - passenger side - not coming from windshield, no debris clogging cowl; not coming from heater fan motor; dealer says leak is a common problem most likely coming from windshield wiper motor cowl and can repair for $400 -$500. Any ideas where else it could be coming from?

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