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Originally Posted by Stocker
A) A cap designed for a sealed system will allow coolant to flow from the tank to the radiator when atmospheric pressure is greater than the pressure in the radiator - in other words, air pressure pushes it in as the radiator cools and is negatively pressurized...
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This takes place while the cap is still at it's relief pressure (open)? Most caps open at 15psi... I did a lil looking and normal atmospheric is 14.7psi. This seems to be throwin a wrench in the works! More explainin please... Better yet tell it like I'm a 4 year old. Maybe I can get my kid to help. (I'd throw a smiley in there but don't know how)