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Old 11-12-2020, 04:38 PM
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Tom Wells Tom Wells is offline
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Join Date: Mar 2000
Location: St. Augustine, FL
Cobra Make, Engine: E-M / Power Performance / 521 stroker / Holley HP EFI
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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
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