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Q: Water leak onto driverside floors, where from? on 1997 Toyota 4Runner

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I have had to take the carpet out of my 4-runner due to a leak, from where, i dont know? I had the drain tubes in the sun roof replaced last year, all the seals around the doors look good...any suggestions about what else to look at????
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Have you had the heater core checked? In older vehicles, the way they manifested need for repair or replacement was to leak on the carpet,floor of the vehicle. Notice not as efficient heat output lately?
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Has the windscreen been replaced and or do you have any rust around the wind screen area?
If you have the carpets out, let the truck dry out, then with the doors closed get a friend to use a garden house and apply water around the windscreen, door jambs and grill opening at the bottom of the windscreen, you will need to be inside the car with a flashlight and carefully looking at the door seal/frame around the door, look under the dash while your friend applies water around the windscreen ect.....
Chiming in here. I just bought a used 2007 4Runner and found water under the mat in the passenger side floor. Not a windshield leak or AC drain. I found out what it was though.

Under the car about where the back bolt of the seat would be, you will see a rubber plug about 3" wide. The plug there was dislodged and it goes right up into the carpet. You can actually feel the carpet through that hole. I popped the plug back into place. I'm guessing that water from when it rained was splashing up into there and collecting in the low spot under the mat/carpet.

ps - not really sure what that plug is for though. Any ideas?
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