Quote:
Originally Posted by Old Mechanic
Absolutely not. Cap must be on and tight before you start the engine. That pressurizes the system, as it warms up, to help the bleeding get the air pocket out. It will NOT work if you leave the cap off and as the coolant heats up it will overflow with the cap open.
regards
mech
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Ok that's what I figured. I'm at work right now, so I'll check it when I get home and do as you said exactly.