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I personally have never had any trouble with trapped air in the Passport 3.2. I make sure I park with the nose uphill slightly, set the dash heat control to full hot, and then run the motor with the rad cap off until it starts to steam a little and I see some motion in the coolant inside the radiator. Then I cap it and let if come up to full operating temp before I top off the expansion tank. Check it after a couple of hot-cool cylces, but my experience is the 3.2 system is good at clearing air out.
I replaced my water pump when I did the timing belt at 130,000 and it looked like new. I doubt it's the culprit. These aluminun rads react poorly with ethylene glycol if you leave it in for more than a couple years (!)and create deposits that cannot be removed with conventional flushes - I doubt they can even be rodded-out, because the deposits are essentially like a thin coating on the metal preventing heat transfer, not an actual blockage.
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