If you have a hole in the expansion tank cap the system will be un-pressurised, and boil at 100 deg c.
On my build I a put a blanking cap (i.e. never vents) on the radiator and had the expansion tank vent at 14psi.
Before that the radiator vented first and being lower then the expansion take slowly lost coolant.
Last edited by Chris Cussen; 18th April 2016 at 11:39..
Reason: typo
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