Quote:
Originally Posted by Ultramaroon
If it mysteriously loses coolant over time, it's because the system cannot maintain pressure. There are always hot spots along the coolant path. If pressure bleeds off, those hot spots will start to sizzle and keep sizzling until the rate of boil comes to equilibrium with the rate of leakage.
If coolant loss is not accompanied with a lingering smell of antifreeze, it is almost always due to a leaky check valve in the radiator cap.
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The overflow tank is vented. If coolant gets hotter than 100C, some will likely evaporate out of the vent.