[Vwdiesel] pressure

[Roger Brown]

cass wrote:
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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?

I had this happen, due to a corroded coolant passage in the head, the undermined the head gasket and allowed a small leak between the cylinder and cooling system.  No oil/coolant mixing, but would get the cooling system pressurizing, enough so that the
pressure cap would blow, causing coolant loss followed by overheating (due to the lowered coolant level).

--
    Roger