i think this is the same problem i had with my Saab engine. i blocked off the heater circuit and it kept doing the same thing. on some engines the heater circuit has to have a constant flow or it overheats before the stat opens. unblock 3 and either take it to the top of the header tank or splice it into the top rad hose.
a good tell tell sign of the system flowing properly is that you should see water returning to the header tank through the top pipe. if that is not happening then there is something wrong.
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