Question about GMC Sierra 1500

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I'm leaking coolint from the bottom of my truck and coolint leaked on to my floor inside I need to know how to bypass my heater core thank you for your help and time Oh ya almost for got I have a 2000 gmc serria 1/2 ton truck 1500 seris

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Purchase a 5/8 to 3/4 hose union and connect the two heater hoses to it. Just remove the two hoses from the heater core to do this. You will not have heat this way although the leak will be fixed
The union can be purchased at most NAPA Auto parts Stores

Posted on Aug 07, 2010

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Posted on Jan 02, 2017

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1 Answer

Could a bad thermostat make antifreeze leak onto drivers side floor?


Not the thermostat, that is on the engine. You must have a leaking heater core- this is the small metal thing, looks like a book-sized radiator. It fits inside your heater case and is what gives you warm air from the heater. Your only recourse is to remove and replace the heater core. On older cars, this was not a big deal- the heater cores were fairly accessible under the dash. Newer cars, it's not so easy-so much stuff in the way, in many cases, the entire dash must be removed to get to the heater core. You might get lucky and it will be a simple job.
If you need to drive the car before you fix the leak, you can bypass the core by splicing your two heater hoses together. You won't have heater or defrost then, too bad it has to happen during the winter, but that is the only way to safely use the car until the leak is stopped. Don't trust Bar's leak or similar coolant sealers: Your leak is probably too big for them to work on, and those sealers often cause more problems than help.

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1 Answer

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The only water leaks I know that appear inside a vehicle is normally from a bad heater core, but that normally leaks onto the floor of the passenger side. I would check your heater core regarding this problem.

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1 Answer

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Sounds like the heater core is leaking. The heater core is located inside the vehicle, usually contained within a plastic box, when the heater core leaks enough, the plastic box will fill up with coolant and eventually leak out, usually onto the passenger side floor. Hope this helps.

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1 Answer

My heater core is bypassed, car overheats, leaks when started and shakes, lexus is200


More than likely since your heater core is by-passed,your thermostat was probaly removed and you may be without one.Here's a link to check and replace it.Here's a link to heater core.Your heater core could be bad since it was bypassed,does the front floor board have water stains anywhere.

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How to remove the heater core from a VW Golf MK3 1997 station wagon. There is engine coolant leaking onto the floor of the car. I have bypassed the heater core and eliminated the leak, however obviously...


If you google exactly what procedure you wish to perform, I guarantee there's more than one instructional video you can view online - usually youtube. That's where you need to be looking. . .

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Just bought truck. Heater hose shorted from pump to return (heater not hooked up) Is there a special valve in supply or return line or is pump supply just hooked to bottom heater fitting, and return...


be careful ! usually when people do that its because the heater core is leaking and they bypass it with the hose so if you hook it back up you might have a mess inside of truck !

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My 1996 Cadillac Sedan Deville heater blows cool air and engine is running at normal temps. It never seems to get up to temperature.


If you are not the original owner, the previous owner may have bypassed the heater core. The heater core is like a small radiator that has hot water running through it from your motor. It is inside of your dash board, near your a/c and heater controls. That is how yur car gets hot air. The air runs through the heater core making it hot. Bypassing it is a cheap and quick fix for a leaking heater core. When they get a leak, they leak all inside the car down to the floor board. Check under the hood along the fire wall. If it is bypassed, you will see two hoses spliced together. One will be bigger that the other slightly. If this is your problem, you are more thatn likely need to replace your heater core

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absolutely can be the windshield. With an assistant sitting inside the car to examine the windshield edges as you slowly apply a slow soft stream of water on trhe windshield, going slowly starting at the top. If in the end , no leak is found, examine inner firewall going up under dash for water drippage. No guarrantee the leak is the windshield. Could be a side door or window leaking. Imagine if your carpet was soaked with engine coolant. Could be the heater core leaking into the inside of the car.

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This is most likely the heater core. You'll see the anti-freeze leak sometimes outside the truck because some heater boxes have a drain tube for this reason. Of course, it could possibly be a loose heater hose connection or a leaking 'diverter or bypass valve'. Most often it is the heater core though. Pay extra attention to your coolant level until it's repaired, so as not to run low on coolant and overheat your engine.

Most heater cores can be replaced with just basic mechanical knowledge and tools. Click here for a step-by-step video of how to go about it. Good luck!

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Sounds like the heater core (a small radiator of sorts under the dash) is leaking or a hose going to it is leaking. If in a warm climate, you could bypass or block the heater hoses temporarily. Their only purpose is to make heat avail to interior of car. The 2 heater hoses either connect to feedthru's at the firewall or simply pass thru the firewall to the heater core. Every car I've seen has it on passenger side.

Peer up under the dash, it should be clear where it's coming from.

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