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I have wet floor boards on both sides of cabin. What do i need to do to bypass heater core?

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  • Jeffrey Turcotte
    Jeffrey Turcotte May 19, 2017

    Please provide your make, model, and year to help with this.



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  • Cars & Trucks Master
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Disconnect both hoses from heater core at the firewall. Simply connect them together using a short piece of tubing the correct size (5/8 or 3/4 O.D.). 2 hose clamps are required also.

Posted on May 19, 2017


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2000 Impala leaks coolant out hose in firewall

It sounds like you're looking at the heater core water lines. These connect to the heater core supply and return inlet and outlet pipes to bring hot coolant into the cabin for heat and windshield deicing.

The heater core is a mini radiator and operates on the exact same principles as the radiator does. The heater core is located behind the dash board on the passenger side. Look for a wet spot of antifreeze on the passenger side floor area - close to the firewall for an indication of a leaky heater core. If it is leaking, it will likely need to be replaced. This can be a pricey repair.

Good luck!

Jun 14, 2012 | 2000 Chevrolet Impala

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I have a 2003 acura mdx, which has water on the floor on the passenger side, I have took the car to glasses place, they have perform a leak check and have found no leaks on the winshield, I have vacuum the...

A way to check if windshield is leaking, take it to someone who has air compressor. Have someone sit in car while other person sprays air pressure at suspect areas and listen for air leak.

Jan 04, 2011 | Acura MDX Cars & Trucks

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Water under my floor mat on the passenger floorboard on the passenger side of my 2004 toyota

smell it i bet its not water but coolant heater core will leak when bad do you smell sweet smell in cabin of car if so coolant leakage

Dec 23, 2010 | 2004 Toyota Camry

1 Answer

Wet floor on the passanger side in front and behind front seat. took out front seat and nothing. 2003 yukon xl 1500 2 wheel drive

Check your radiator fluid level, if it is low it is a good chance your heater core or the hose to the heater core has a leak. The heater core is a small version of a radiator which has the air from the blower blow across it to force warm air into the cabin of the vehicle. You will need to probe under the passenger's dash to locate the leak.

Nov 16, 2010 | 2003 GMC Yukon XL

1 Answer

There is water puddling up on the passenger side floor and actually seems to be coming up thru the floor, nothing leaking down from anywhere.

ok you got some possibles.1 check cabin filter if signs of water than drain plug on fire wall cloged.causing water to enter by over filling and no were to go.but thru the filter.easy fix.also if you losing anti-freeze than that will point at your heater core leaking from line or core itself.need to test it,turn on heater and check floor with a towel. lay it on floor going up to firewall inside truck.go for a good drive so pressure can build and heater on.while engine hot look at floor towel top part by firewall wet prob heatercore.also check if door is wet to eliminate possbility of door seal leaking.let me know.

Aug 13, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Floor board leaks on passenger side and there hardly any heat, unless i rev the engine a bunch

Very likely your heater core is leaking and that's why the floor is wet.
The reason you are having problems with the heat is that the coolant level has gotten lower than it is supposed to be which can and will eventually result in an engine overheat.
Unless you have lots of time and experience I don't recommend you attempt doing that job...entire dashboard need to come out to get to it.
Worst case, cut both heater hoses in front of the firewall and install about six inches of copper pipe as a bypass. You will have no heat but won't loose the engine either. You could try a sealer, but most won't work well in heater cores.

Feb 01, 2010 | 1996 Jeep Grand Cherokee

3 Answers

What would cause front driver side floor to be wet and windows were shut

HI. Two possible causes here. There may be a crack in the weather stripping on the windshield assembly ,or the heater core has ruptured, thus causing the coolant that flows through this device to leak out onto the cabin floor. The core is mounted under the dashboard. Inspect the hoses that connect to the core. If they are not loose, and the clips are tight, the core may be damaged. Check the weather stripping on the windows, and front windshield for cracks and weak points, as well.

Replace the heater core if the leak is visible in the general area of the core device.

Dec 30, 2009 | 2001 Hyundai Accent

2 Answers


I beleive that is the side were the drain for the A/C condensor and heater core is. Check and see if the drain is clogged..?

Dec 20, 2009 | 2003 Ford Ranger Regular Cab

1 Answer

Heater core?

ok most cars you wont see a physical drip because the box is sealed to the firewall it will run out the drain hole the same as the ac if bad enough they will leak down the insulation right to the floor board running pure water will cause rust but rarly causes the heater core to blow what you arre looking for is the problem that started it all why she was adding water to begin with you didnt mention the type of car and motor so i really cant get into diagnostic procedures you can bypass the heater core on most cars if it is using that much water you propably have a blown head gasket that will make the heater core blow let me know the type of car and I will help you diagnose it further

Jun 19, 2008 | 1997 Pontiac Grand Am

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