Question about 1999 Mitsubishi Galant

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AC condensation leaks inside at passenger floorboard. It is not heater-core related.

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  • Anonymous Mar 23, 2014

    Seems to be related to automatic ac/heating system or possibly the heater core

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  • Mitsubishi Master
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There should be a drain tube on your firewall somewhere, it must be plugged.

Posted on May 25, 2009

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I am getting water on the passenger side floorboard


Water or coolant? Coolant (if you have the correct 50/50 ratio of water and antifreeze) will have a distinctive smell.
If it's coolant that's getting on the passenger side floorboard, you probably have a leak in your heater core.
If it's water, it may be condensation from your a/c evaporator - there's a drain that should allow the condensate out of the HVAC box, but if it's plugged, the water will come inside. The other possibility if it's water is that there is a leak around a window seal, windshield, sunroof, possibly the door window.

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If you have water in your floorboard, it sounds more to me like your heater core is leaking. Are you sure it's AC condensation? Is the floorboard constantly wet or only when the AC is on? Check your coolant level and see if it's low. Check to see if it's more like antifreeze in the floorboard than just plain water.

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What is causing water to leak down onto the passenger side floorboard of my 2004 Mazda 6 wagon when I have AC on?


Feel the water and smell it. If it smells sweet and fells oily, is is coolant. If is isn't oily and has no real smell, it is water. There is a tray under the evaporator and heater cores that catches water/coolant and drains it via a tube thru the firewall to the outside of the car. This tube is probably clogged and needs purged. If you have coolant on the floor, you'll need to replace the heater core. If it is water, purging the hose will solve the problem as the water is just condensation from the AC coils

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Your drain a/c condenser is clogged; check this to solve...


Good luck (remember comment and rated this).

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Floorboard on passenger side is soaked, why?


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You have a bad "heater core". It will leak inside, and outside once the enclosure fills. You need to replace it, or bypass it before your engine overheats and causes a lot more damage. If you're driving the vehicle daily, make sure you check and fill your coolant before you drive it.

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1 Answer

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Auto ac units have an outside drain for the condensation. If you ever noticed a car running and it looks like it's leaking something on a hot day it's the condensed water from the ac unit draining. What you have is a clogged or disconnected drain hose.
You need to find the hose and drain and reconnect them. Sounds simple, good luck.

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