Allan,

I help Dennis in his garage(sometimes) when he is backed up, and I would say
we have
followed his procedure at least 50 times with no problems. The trick is to
have a helper
at the front of the van watching the flow, while Dennis is in the back adding
coolant and keeping
the idle up. Once we get a consistent, bubble free flow up front I close the
bleeder and we
wait for the radiator fan to come on. I check that both sides of the radiator
are getting warm,
thereby ensuring we have good flow. Once the radiator fan comes on and goes
off, you can be
pretty sure you did a good job.

Tim