[Tom Wells]

in,

I have an overflow can for my radiator, so I just warm the engine, let it cool, and top it off. The air goes out as the coolant expands when the engine warms. After a few refills the overflow can gets enough water pushed into it which then is sucked back into the radiator as the engine cools.

If I could get to it, I'd prefill the overflow can. Since I can't get at it, this method works fine but takes a few more heat/cool cycles.

It usually takes 4 or 5 cycles to get all the air out.

Been there; if there's air, the thing will overheat fairly quickly! After it's full it will happily idle or cruise slowly all day long.

Tom