The most misunderstood function of any cooling system is pressure ... Basic Physics 101
>> I Water boils at 212 f at sea level (I know it's~~boring boring but follow) However ,
water cannot boil if it's under pressure. Steam won't cool anything so it's essential to keep
the coolant under pressure so it stays a liquid,
It's obvious that if your engine temperature can climb to 220 degrees (8 degrees above
boiling) that it must be kept under pressure or it will boil away.
If there is not a perfect seal in the cooling system ... the water will boil ,, and it can boil
very slowly so you don't even see it until so little coolant is remaining it boils BIG TIME.
The culprit may be at the radiator ... specifically the mating seal between the radiator cap
and the neck that it attaches too. Check the mating surface on the radiator ,,, is it smooth?
Look at the rubber seal on the cap itself is it soft? If you have any doubts at all then invest
a few bucks in a new cap.
