Daniel Stevens wrote:

>...I'm becoming rather keen on the NO COOLING SYSTEM PRESSURE aspect..
>
>8. Pressurization, a method to raise the boiling point of water-based coolant is not necessary. With low pressure, system components are under reduced stress.
>

FWIW -- I once gutted a problem expansion tank cap to temporarily
resolve an issue.  I thought the only difference would be that the
boiling point of the coolant would be increased -- but in fact the van
ran lousy that way.  As I recall the engine was constantly surging --
both at idle and while driving -- both cold & hot.  A new cap returned
things to normal.

Never did figure out the connection between the cap/pressure/surging...
but there it was.

Geo H

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