The caps used with a recovery system have floating sealing ring inside by the sealing rubber that seals under internal pressure of the radiator but releases when the cooling vacuum forms in the radiator to allow the recovered coolant to syphon back into the radiator. The covery hose must go to the bottom of th recovery tank and the recovery tank must be vented.
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So if you have a radiator cap now with just the hose that lets the overflow hit the ground, is it vented or unvented? If you add a recovery tank, would the psi go up, down and cap have to be vented, unvented? Sorry for the stupid questions, but thinking of adding one myself and don't want to cause any issues.
Radiaotors are a sealed unit that only releases pressure at a designated point depending on the pressure release of teh cap used. Pressure in the cooling system raises the boiling point of the coolant allowing the coolant to stay liquid to absorb heat better.
