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Why do people insist on running engines with the rad cap off? The system needs to be pressurized or you will always be creating bubbles.
If you have no way of doing a proper vacuum fill, engine off, fill it up with your funnel and crack the bleeder valve. Once it's full and you've got no bubbles on either end, seal it back up and give it a steady 1000-1500 rpms to warm it up until the thermostat open (keeping an eye on the temp of course). Shut her down and let cool. Reinstall funnel, open bleeder and top off system.
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