Just couple the two hoses connecting to the heater core like chunk said. Problem solved, or at least by-passed. No reason whatsoever to make it complicated, and that way you can always reverse the bypass in about 2 minutes.
Anyhow, heater core replacement is a big ol' royal pain, but it can be done. I lived an entire winter without a heater core. Cold sucked, but the biggest problem was not having defrost. Windows kinda fog up after a while. It took me having a date and not wanting my lady friend to freeze to get mine fixed. A buddy helped me out and we got it done in about 2 and 1/2 hours. Expect it to take longer than that; he'd done a couple before.
--nathan
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'91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back.
Daily Car: '04 Infiniti G35 Sedan 6MT
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