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Anonymous Posted on Jun 17, 2017

Mercury 1997 Grand Marquis has a water leak to the driver's floorboard

This only happens when it rains. More water seems to come in when the car is parked than when it is being driven. I have removed the carpet and padding. The water appears to be entering from up under the dash (due to water trails) on the left front corner and in front of the brake pedal. I have pulled the drain plugs in the floor so there is no build up of water anymore. I have seen about one inch of water on the driver's floor board after a storm.

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Steve P

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  • Mercury Master 3,912 Answers
  • Posted on Jun 17, 2017
Steve P
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Have you had the windshield replaced lately??.. if so, they did not seal it well. Check the windshield wiper shaft for wear and a seal..
sometimes these are hard to diagnose. ..sorry..
"You kinda have to be there when it rains.."

SeabeeMechanic

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  • Mercury Master 1,367 Answers
  • Posted on Jun 17, 2017
 SeabeeMechanic
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Could be a leaking hear core or hose that goes into the core.

  • Steve P
    Steve P Jun 17, 2017

    It ONLY happens when it rains!

  •  SeabeeMechanic
    SeabeeMechanic Jun 17, 2017

    If it's only water, then you might have clogged drains that run along the side of the cowl area. You may want to remove the wiper blades, arms and the plastic cover. Take a visual look at the inner corners of the frame and you may find dirt which is not allowing water to run out. Sometimes, it's also a good idea to remove the inner wheel well covers that will give you access to other end of the drains slots.

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Anonymous

  • 85 Answers
  • Posted on May 22, 2010

SOURCE: 1993 Mercury Grand Marquis, Brake fluid leaking

Hi, the reason the pedal goes to the floor is because the brake line going back to the rear axle blew, first you will need to find where the hole is and cut out the bad section, usually you can find a clean spot further down that you can cut out the bad spot. you will need to go to the parts store and get a new piece of brake line and a tubing cutter and a double flare kit. usually you can rent one of these to save money.

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Drivers side floor fills with water when it rains

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If you need further help, I’m available over the phone at https://www.6ya.com/expert/justin_3ae27a9d61d6acd4

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Water leaking into rear passenger floorboard

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