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That wasn't my suggestion, but that is a good idea.

As I stated before, the overflow tank won't help, no matter how high your have it.

I got my heater installed this week. Even though it sits below the top of the radiator and I used a vacuum/coolant-fill device, I still had a bit of air trapped in the coolant system. There is a bleeder screw on the top outlet at the engine on my clone that helped get some of it out. I also had to angle the heater core downward to finish bleeding all of the air out of it. I'm still waiting on the directional vents to finish it up and then I'll post a picture or two.

In the meantime, if you have a way to move the heater core around to get below the top of the radiator, or use the heater hose/transmission funnel fill technique that I described above, you should be able to get all of the air out.

Edit: The plug for the water pump looks a lot like a coolant temp sensor. I'd bet that you could take a picture of it and run to the local auto store and find a correct pigtail for it.
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