In a word: No. If the head gasket (NOT the "valve gasket") is leaking,
it may be pressurizing the cooling system enough to blow the coolant out
past the pressure cap on the expansion tank, while the engine is
running. However, when the engine is shut off, if the valves for the
combustion chamber with the gasket leak are closed, the cooling system
will remain pressurized until the rad plug, or expansion tank pressure
cap are opened. If one of the valves is open, there will be no vacuum
or pressure to effect the cooling system, from that combustion chamber.
The important thing to remember is to not do anything major (like
pulling the head off) until a diagnosis is CONFIRMED by pressure-testing
But, like I mentioned in my earlier post, and as Vern says in his post,
indications are of a head gasket leak.
[mailto:email@example.com] On Behalf Of
Sent: Friday, April 25, 2008 10:37 AM
Subject: Re: [Spridgets] cooling system issues revised---Help
if it was a gasket wouldn't the coolant flow back into the radiator once
cooled? I am seeing it full in the expansion tank. It seems to flow
from radiator>engine>expansion tank>ground instead of back to the
radiator. But I will have the compression test done. ideally today but
if i have a potential valve gasket leak will that confuse the results?
should I replace the valve gasket, have the compression test done, the
potentially rip the engine apart and do the head gasket? I really am
new to this level of repairs so I am clueless.
-------------- Original message --------------
From: "firstname.lastname@example.org" <email@example.com>
> Ryan: I am surprised that no one seems to have suggested that this is
> the classic symptom for a blown head gasket. Maybe I missed it.
> Vapor from the combustion chambers push the coolant into the
> expansion tank and you lose it.
> firstname.lastname@example.org wrote:
> >Okay, I have replaced the missing thermostat and did a coolant flush.
> again after a long ride in traffic she was leaking antifreeze out of
> expansion bottle. After letting her cool for a few hours I opened her
> found most of the radiator empty and the expansion bottle filled to
> pipe. This seems to imply that the coolant is cyling through the
> the expansion tank and then pouring out instead of cycling back into
> radiator. Now what? Oh and for further fun I have no working temp
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