> I like the puking analogy.....and that would explain why the
> electric fan
> might turn on after you've shut the engine off.
They happen for the same reason : when you shut the engine off, the insides
of the cylinders are still hot. That heat moves into the coolant in the
engine block and cylinder head; but the coolant is no longer moving to carry
the heat away to the radiator. If the coolant inside the engine gets hot
enough, it boils a little and forces coolant out the overflow. The boiling
absorbs heat though, so it cools the engine and stops the boiling.
A higher pressure cap means the coolant can absorb more heat before it
boils.
Randall
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