Some people have put a T into the upper hose. With the T inverted, the extra cap is the highest point and can be used to work all the air out. If you don't want to do that, you can just unbolt the CAC and lift it up at an angle so the cap is the highest point in the system. Just fill it up, run the pump, and repeat until you can't add any more. It will take a while...
The ECM turns on the IC pump by grounding the yellow wire. However, the stock ECM's program doesn't turn it on until it's already way too heatsoaked to do any good. When you hotwire it, you're basically inserting a false signal to the relay, telling it to turn on. Everything is still working exactly the same, just that it will always receive the "turn on" signal, not just when the ECM thinks it's hot enough to need it. Obviously the pump is going to be running all the time, instead of hardly ever, so you will have more wear on that. There are some high mileage hotwired stock IC pumps out there that are still doing OK, and the Jabsco is even better. In short, I wouldn't worry about it.
Doh, you said Shurflo, not Jabsco. The same should still apply though. It'll be running the pump a lot more than usual, but it's still "normal" operation. And for bleeding, the best way is probably still just to lift the CAC up to the highest position.
I was under the impression that most heat exchangers are sold without pumps, though I don't actually have any firsthand experience...
