Question about Lexus GS 300

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My 1999 Lexus GS300 is accumulating moisture/dampness beneath the driver's side carpet. No evidence of water is anywhere else on the floor. I suspect the A/C system somehow, but after having a technician inspect it, could not find the fault. Don't think any of the moisture is coming from outside the vehicle (rain, etc.) but from something near the dash or firewall. Suggestions?

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The wind screen seal is most likely the reason.Use some clear silicone

Posted on Jun 26, 2009

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I have no heat in the winter and it sounds like i got water in my dashboard.


Most likely a bad heater core. It's behind/under the dash. There should be two hoses that go into the firewall under the hood. These carry and return warm coolant to the heater core. The blower motor blows across the heater core and pushes the warm air into your car. Try feeling the carpet under the dash on the passenger side. See if it's damp. Many times if the core starts leaking, your carpet will be damp over there. I've also seen them completely plugged up with dust/dirt/debris/insects, so the air wouldn't flow through it from the fan.

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We had same--water on driver side rear floor (soaked!). Driver side front floor seemed dry until feeling UNDER rug, was slightly damp. We found the location of TWO leaks causing this.

Leak #1 was through the parking brake line/cable seal; Recaulked with silicone. Removed plastic trim on floor between floor and door to reveal metal channel filled with water.

Leak #2 was where the door meets the car, near the hinge. It was the accordian-looking tube housing the wiring for the door. The big, rubber, circular plug connecting it to the main part of the car had come loose and water ran down through that, into the SAME metal channel filled with water from leak #1; will seal with silicone.

Note: We found that the channel filled extensively near the front door, BUT the carpet edge from the floor near the rear seat was dipping into it, wicking it up to the rear floor. Also, upon acceleration, the water in the channel gushed toward the back, thus soaking the rear carpet.

These leaks were found by removing all plastic trim (covering edges of carpet by doors), then one of us pouring water into specific areas of the exterior of the vehicle, and the other one watching closely with a flashlight for any signs of dripping.

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1 Answer

Heavy rain leds to water on drivers side floor


you might want to peel the carpet back and check for hole in the floor board. this is not something you can see just by crawling under to look at. Light has to pass through. Carpet pulls up easy from under the pedals, remove thebottom of the door jam like four screws and then you will know for sure.

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Have your ac evaporator deain cleaned out or checked. Without this working the ac water will collect there.

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Is it possible the water is actually coming from the A/C evaporator case, whose DRAIN IS CLOGGED ? The water produced by the A/C then leaks out of the case, down under the carpeting, then depending how vehicle is parked, can flow to the rear floors and carpet. Hope this helps

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sounds like you may possibly have moisture in your fuse box in car.or a pin fit connection problem.

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check out your door seals may need replacing. drive it thru a carwash to locate the spot.

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It may be due to the air conditioning hose being blocked. Therefore the water must be backing up into the vehicle, under the carpets and into the back seats instead of flowing out

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