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Discussion Starter #1
Does anyone have a cooling system flow diagram for a heater core that has 3 ports/tubes?
Since I purchased my 68 Fairlane, the heater core was disconnected since it leaked. Additionally, the AC had been removed.
I installed a new 3 port heater core and I need to find out which ports to use.

I've read several posts here and there doesn't seem to be a definite answer. The only thing that I have discovered is that the center port goes to the water pump. So one of the outer ports go to the intake manifold.
Given that, I've forced air and water to check for flow and it appears to be equally coming out.
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