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most of the water does not even travel via the thermostat so it should always pee.
if it stops after getting to running temp the water pump would not know anyway so I suspect a powerhead area problem and not getting anywhere I would pull the head and inspect for something blocking the water passages. run air pressure backwards from pee hole and thermostat water inlet . pull the exhaust cover to inspect
just in case….the water flow diagram shows both the cold and “cyl warmed up” water exiting the thermostat mixing together when the running temp is reached . the mix gets dumped out
the common area for both cold and hot being the thermostat cavity and if BOTH cold and hot water suddenly stop flowing out and down ……..check to make certain the “thermostats area” isn’t causing the problem..even if you pulled the thermostat to test .
try to run some mono line in all water passages you can reach
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