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Originally Posted by CG
if the system cools and the cap goes back how does the coolent get back into the system if the hole is covered?
some of the over flow bottles ive seen are just that, bottles like a jim beam bottle or a beer can etc. ...anyway all those will do is catch coolent and not let it get sucked back because its non pressurized?
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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.
B) Anything will work as an overflow tank; it's not pressurized. All you need is a hose that reaches near the bottom of the tank. Some of the OEM units have the hose connection at the bottom of the tank, so 100% of the coolant can be recovered, if necessary.