Usually you just buy hose and bypass the core.
There are two heater core hose that goes to the firewall the inlet and outlet. through that hose, you will also have the rear heater core hose attached to a T joint in both the inlet and outlet hose. You splice the hose of the front heater core inlet and connect that to the rear heater core inlet hose. Same goes to the Outlet hose with the T joint using a conncetor which you can buy at your auto parts store, 3/4 inch size. Basically you are bypassing the front heater core that is connected to the firewall. You wont have any defroster and heater for the front, but the rear vents and control will have heat.
buy the "Lisle Tool Heater Hose Coupler Remover #62200" from a parts store like Advance
www.oehq.com
You can buy a replacement hose at an auto parts store. Or, if your heater core is bad and you are not replacing it, you can disconnect the other hose from the core and reroute it back to the intake to keep the water circulating through the engine.
Finding this part in an automobile store may be vary difficult. Your best bet would be to have them ordeer it for you. Now most automobile shops may not do custon orders so you may have to visit a customs shop/garage.
buy a Chilton manual and it will tell you most of what you need to know.
The longest i know off is 24 in. -- if you have too -- put two together with brass nipple in between
Disconnect both hoses and just use or buy a u-shape hose and that will be your by-pass.......
I just replaced the heater core on my 2001 Chevy Silverado. What a _itch. You could not pay me enough if I were a mechanic to ever do it again. To answer you because I had cut the hose from my core to remove it. You need a special tool from your parts store that slides in the top of the fitting and opens it up on the inside to slide off. If you are replacing the hoses which I did they are usually 5/8in. but I could not get it to fit into the fitting on the block so I went with a 3/4in and bought a bushing to fit inside the hose and go back down to a 5/8in for the motor side. I'll never buy another Cheverolet because of the difficulty in replacing their heater core. They are the worst. Eddie Peterson
Go to either a bookstore or a parts house and buy a Haynes Manual and it will give you the full details with pictures. jd
First Quarter of 2009 It will run as a 2010 Camaro.