Not sure if this is what you are after but try this link..
Step 3: Connect the Hoses Together. Use a hose connector or hose coupler to attach the two ends of hose together. That way, the anti-freeze that would be routed through theheater core will instead just go through a short loop of tubing.
How to Bypass a Car Heater Core ' DoItYourself.com
www.doityourself.com/stry/how-to-bypass-a-car-heater-core
How can bypass the heater core Google Search
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.
SOURCE: BLOCKED heater core
remove one of the heater core hoses at the bulk head or firewall and loop together where they go to the engine so no coolant goes into cab (through firewall)
SOURCE: how to bypass heater core on a 1995 isuzu
you need to remove the two hoses going into the firewall and plug them.They sell plugs and hose clamps at the parts house. Measure the hose size which is either going to be a 1/2' or 5/8" or 3/4"
Testimonial: "very helpful...thanks for the info "
SOURCE: heater core leak. How can I temporarily bypass
Purchase a hose mender or flush tee. Find the heater hoses under the hood. They will be on the passenger side of the engine and should be 5/8 or 3/4 I.D. hoses. Cut both hoses and install the mender or tee in between the two ends that go to the engine. Usually on hose is 5/8 and the other is 3/4. buy one of each size fitting and try to stretch the 5/8 hose onto the 3/4 fitting. If you can't, when using the smaller one, you will have to tighten the clamp extra tight when fitting the 3/4 hose on the 5/8 barb. get yourself two wormgear clamps in either case.
For heater core replacing procedure. I suggest you to go through
this related help links.Its all complete step by step procedure: ----How to replace heater core for All car models?
Click the link below: ---
http://technoanswers.blogspot.com/2011/11/how-to-replace-heater-core-for-all-car.html
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How to Flush Heater Core?
http://schematicsdiagram.blogspot.com/2011/12/how-to-flush-heater-core.html
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How to Remove Heater Core ?
http://howtobyme.blogspot.com/2011/12/how-to-remove-heater-core-on-2008-honda.html
Heater Core Replacement?
http://howtobyme.blogspot.com/2011/12/honda-heater-core-replacement.html
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To replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on.html------
How to replace heater core?http://technoanswers.blogspot.in/2012/02/how-to-replace-heater-core-on_10.html
How to replace heater core
on Buick Regal?
http://howtobyme.blogspot.in/2012/02/how-to-replace-heater-core-on-buick.html
----------This will help.Thanks.
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