I've had great success using this "Air Lift Cooling System Leak Checker and Purge Tool Kit" on completely dry or partially dry cooling systems. It pulls all the air out, has a vacuum gauge to test for leaks and uses the vacuum created by the tool to fill the system with coolant. I believe there was already a discussion on this perticular tool in the forum somewhere.
The last time I did this, I used my friend's equipment to do the job at his shop. It's Matco's version of the same tool and just a little more expensive.
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