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How to bypass a heater core to where you can drive or can you drive it while it is leaking

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  • Contributor
  • 6 Answers

Make damn sure you blow out/drain
the heater core after you bypass it..
The coolant (antifreeze) is highly toxic
and needs to be cleaned up and the
carpet dried out..if you don't do this,
you can subject your passangers
to the toxins, especially on a hot day..
Use a shop vac to get rid of any moisture
especially on the front carpets..

Posted on Apr 22, 2017

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  • Cars & Trucks Master
  • 1,043 Answers

You can remove the upper and lower heater hoses from the heater core, put a piece of pipe or copper pipe into the end of each nose and clamp the hoses onto the pipe. Check for leaks and refill the radiator. Just know there will be no heat to the car.

Posted on Apr 22, 2017

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Posted on Jan 02, 2017

lesabre1972
  • 474 Answers

SOURCE: 1993 FORD Taurus Heater Core leak/\ Can I bypass the heater coil to get the car on the road?

I would disconect heater core hoses at fire wall and put in a piece of metal pipe of the same diameter clamp it well and it should get you where you want to go for now.This is just temporary!

Posted on Aug 23, 2008

  • 140 Answers

SOURCE: bypassing heater core on 1993 audi 90

yes u can bypass the **** core. all you need to do is, take the two hoses going to the heater core, and take em off the heater core, take one hose comply off, and hook the other remaining hose were the other hose was hooked up at.. this will bypass your heater core, but keep in mind you will not have hot air in the cabin of the car..keith...

Posted on Mar 14, 2009

wavoconqueso
  • 57 Answers

SOURCE: Heater core burned out and I want to bypass the coolant hoses.

Without knowing your car specifically I can suggest the generic way to do it. Locate the two heater hoses going into the firewall, probably on the passenger side. They're the ones that get hot and are about an inch + in diameter. Disconnect. Measure the inside diameter of the hose and purchase a short piece of galvanized or copper pipe (6 inches) at Home Depot. Connect both ends of the hoses to the pipe to form a loop. Secure the hoses so they don't land some place that would cause a problem.

I had this problem on an 85 Tbird. I had heard about a product called Bars Leak and tried it. It worked. No leaks and I kept my heater. You should be able to find it at any parts place at less than $10. Ground black pepper also has worked for me.

Posted on May 09, 2009

  • 25 Answers

SOURCE: A 1999 Kia Sportage. Heater core leaking.

tie both hoses together

Posted on Jun 25, 2009

  • 98 Answers

SOURCE: How to remove the heater core from a VW GolfMK3

there are alot of hidden screws holding the dash in. there are some up across the top of the dash by the windshield and defrost vents. also when you open the doors there are some in there. it is quit a difficult job I really dont recomend doing it yourself but if your not afraid to try and feel confident enough to tackle it good luck. it would be best to have an experienced mechanic do the job but it will cost over three hundred for labor. if you do it yourself go to a parts store that sells haynes repair manuals they cost about twelve dollars and are pretty helpfull.

Posted on Oct 31, 2009

Testimonial: "Thanks for the advice, I will find a manual and if gives some form of help I will do it myself. If not I will pay for it to be done. Thanks."

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1 Answer

Why does my radiator become empty after 30 minuets of driving and water appears on the driver side floor?


Your heater core is leaking, bypass the core by removing hoses from firewall and joining together, or cable tying over, this will get you back on the road until you can replace the heater core.

Aug 06, 2016 | 1994 Hyundai Sonata

3 Answers

I bought a 99 tahoe four door 5.7 350. No heat. Previous owner bypassed heater core. Need to see how heater hoses attach.


Have you replaced the heater core? If not, most likely the reason the previous owner bypassed the heater core was because it leaked. I will be happy to send you photos of how the hoses attach but I will need your email address.

Dec 21, 2014 | 1999 Chevrolet Tahoe

2 Answers

I had to bypass my heater core. I snaked a hose from the input pipe around the motor and tied back in at the thermostat BYPASS HOUSING. I started with a 5/8 hose piece to a 3/4 elbow back to a 5/8 hose...


Was the heater core leaking? Have you checked your thermostat? By passing a leaking core should stop a running hot problem if that was your only leak. Does your cooling fan come on? Has the car been run extremely hot?

Oct 06, 2013 | 1993 Pontiac Grand Prix

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.

Jan 28, 2013 | 2003 Lexus IS 300

3 Answers

2000 dodge darango has no heat, looks like its been bypassed why would someone do that ? is that a problem


it was bypassed because the previous owner didn't want to change the leaking heater core, it is a big job.

Jan 25, 2011 | 2000 Dodge Durango

1 Answer

I put coolant in radiator and I get a/c but my heat doesn't work. I think my heater hose was bypassed by the previous owner. How do I fix the problem?


You should be able to look down in between the motor and the firewall and see if the heater hoses are attached to the heater core. Most of the time when they are bypassed it is because the heater core has started to leak. Instead of replacing the heater core (not a fun or easy job) they just bypass it so they won't leak coolant. So, if it is bypassed your probably looking at replacing the heater core in order to get heat.

Nov 09, 2010 | 1995 Pontiac Grand Am

1 Answer

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

Dec 12, 2009 | 1996 Cadillac DeVille

2 Answers

My heater not working, i replaced thermostat and radiator hoses, had radiator flushed and rodded, and still no heat. What is wrong?


Too much blockage in heater hoses or heater core.
Bypass valve may be stuck on "bypass" .

1. Remove bypass "Tees", but don't discard.
Replace with straight-through hose fittings.
The core may start leaking under the water pressure since there is no bypass hose.

Once the heater starts working, put Tees back in place. You need bypass protection or the engine will overheat.

Sep 25, 2009 | 1996 Ford F150 Regular Cab

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