OK, so the tank sits just a bit higher than the top of the radiator, but the
heater sits higher than the tank.
IMAG1292 by
Rick Paul, on Flickr
The red dot is the
1/2" hose that T's into the heater return hose, the green dot is the overflow port connected to the overflow tank, and the blue dot is the port that is connected to the radiator at the top port on the DS.
Craig, I'm not able to get any coolant into the system from the Harrison tank. Even jacking up the front of the car didn't help.
Rich, I'm pretty sure I have the tank plumbed right.
Avalanche, I did that when I first tried filling the PS, but I'll do it again before I try to start it.
I was actually considering purchasing one of the vacuum coolant filler systems. They use compressed air to suck all the air out of the cooling system to about 24 bars(?), then using a hose to your container of coolant mixture, you open up a valve, and it draws the coolant in without any air getting in. Sounds effective, and the youtube videos looked convincing, but at this point I just don't know the best way to proceed.
Oh, by the way, pay no attention to the weird cap on top of the Harrison tank. It's a fuel cap, and it's just there to keep crap from falling in the tank. You can see the radiator cap sitting next to the tank.