[Fot] Coolant conundrum

[Tony Drews]

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.


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.


Regards, Tony Drews


On 9/23/2023 10:02 AM, Anthony Parker via Fot wrote:
> I'm having cooling problems.
> Need help being convinced that I have to do what I don't want to do.
>
> Brand new short block, same old head, water pump, and radiator.
>
> 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.
>
> 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.
>
> No thermostat and I have confirmed three times that system is 
> completely full
>
> Seems I have combustion gases getting into coolant and then bubbles 
> eventually removing pump prime.
>
> Don't know what else it could be.
>
> Given the apparent direction of the leak, is there any use in trying 
> some "stop leak" product?
>
> Is it time to pull the head again to look for warping or gasket leak?
>
> I suppose it could be a cracked cylinder, but this block has been 
> checked by two different trusted engine machinists.
>
> Desperately trying to get to the RunOffs, Anthony.
>
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