Bill Kearney wrote:

Agreed, this way you're pulling anti-freeze in the same way as the water
is handled.
Just BE SURE to do it only when the engine has completely warmed up.
Otherwise the thermostat won't be open and parts of the system would
still have water in them.

My big issue with this method is that most systems are designed to feed
the manifolds regardless of thermostat position and unless your
thermostat is wide open when you use this method, most of the a/f will
be sucked in, then pushed out through the exhaust without ever seeing
the inside of the block. PLUS, it will be mixing with the water that is
already there thereby reducing the protection level (and possibly
passing the threshold of protection).


--
Regards,
Dave Brown
Brown's Marina Ltd
http://brownsmarina.com/