[Vwdiesel] pressure

[cass]

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hi gang.
i have two questions..
firstly..i believe my head gasket has
gone to the dark side *again*.
though there is no oil in water or water in oil..there
is steam from exhaust :o/
lots :o)  :o(
it has never been over heated.
i have been thinking lastly that there may have been  excessive
pressure building up in my cooling system..
would this be a symptom of a head gasket leak..or...?
without the oil in water or water in oil signs?
and second question..
would this excessive pressure have contributed to my thermostat
not opening?

there is about 5,000K on this gasket.
(it was the 'good' one..forget name )
25,000 on re-build.
thanks for any insight..
im beginning to think i have a crack in my block i did not find.

:::sigh:::
thankyou for any insights..
cassie