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<p>You don't say what kind of car. I had a similar issue in my
TR-4, changed head gasket 3 times and then discovered I had a
crack in the head in the combustion chamber.<br>
</p>
<p><br>
</p>
<p>Sure sounds like a leak from combustion chamber into cooling
system from the description. Temperature spikes after pushing out
water is a classic symptom, the rapid pressurization is a classic
symptom.<br>
</p>
<p><br>
</p>
<p>Regards, Tony Drews<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 9/23/2023 10:02 AM, Anthony Parker
via Fot wrote:<br>
</div>
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<span style="margin:0px" class="ContentPasted0">I'm having
cooling problems.</span></div>
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Need help being convinced that I have to do what I don't want
to do.</div>
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<br>
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Brand new short block, same old head, water pump, and
radiator.<br>
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<div style="margin:0px" class="ContentPasted0">Over three
trials, the engine will run fine and warm up with radiator
hoses and radiator warming properly. Then the hoses and
radiator will cool and coolant temp will spike to 230+.
Radiator cold with sky high coolant temps.</div>
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<div style="margin:0px" class="ContentPasted0">Two more clues,
hoses seem to pressurize very quickly and when I opened the
radiator cap this morning (after cooling all night)
pressurized air and coolant shot everywhere.</div>
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<div style="margin:0px" class="ContentPasted0"><span
style="display: inline !important; background-color:
rgb(255, 255, 255);" class="ContentPasted1">No thermostat
and I have confirmed three times that system is completely
full</span><br>
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<div style="margin:0px" class="ContentPasted0">Seems I have
combustion gases getting into coolant and then bubbles
eventually removing pump prime.</div>
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Don't know what else it could be.</div>
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<br>
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Given the apparent direction of the leak, is there any use in
trying some "stop leak" product?</div>
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<br>
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Is it time to pull the head again to look for warping or
gasket leak?</div>
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<br>
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I suppose it could be a cracked cylinder, but this block has
been checked by two different trusted engine machinists.</div>
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<br>
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Desperately trying to get to the RunOffs, Anthony.</div>
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