Reply to "Cooling system over pressurized"

jfb05177Member

If you use a pressure cap on the expansion tank It will change the pressure relief value on the pressure/swirl tank.

A normal 15 psi radiator cap will "lift" when the pressure under it exceeds 15 psi since the top is vented to normal air. If both tanks have a 15 psi cap, then when the pressure cap relieves the pint or so due to coolants thermal expansion, the pressure in the expansion tank will increase base on the ratio of air/coolant.

say the worst case with the expansion tank nearly full cold, then the expansion tank will reach 15 psi, then that pressure on top of the pressure/swirl tanks cap will add to the spring setting and now it will take 30 psi to lift.

as for the ability to replenish coolant as it cools down, the pressure radiator cap on the expansion will use the vent valve to avoid a vacuum in it as the pressure/swirl tank sucks coolant back in due to thermal contraction

Having the expansion

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