How do you bypass the heater core?

Answer 1

on the fire wall on the passenger side there will be 2 hoses same size right beside eachother. dissconect each of the hoses and then connect them together with a smaller diameter hose between the two of them. DO NOT CONSIDER THIS A PERMENAT FIX! As answered correctly about disconnecting the two hoses from the heater core on the firewall, and joining them together, they are not always the same size like in my 94' Cavalier, just keep in mind reducer fittings. I used a 5/8" to 1/2" copper fitting as that was the I.D. of the two hoses and i recomend using hose clamps to. Who answered origgionally is very correct on Bypassing. It is a quick fix but get it fixed before winter.
Disconnect the two hoses that go to the heater core on the firewall and connect them together or if one is long enough, run it to where the other hose connects to the engine. If your heater core is leaking, you can use liquid glass to seal it. There are several different brands available, it is the radiator stop leak that is a clear liquid with copper colored flakes in the bottom of the bottle. Follow the directions and it will probably fix the problem. It works most of the time.