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One easy way to keep the thermo open, take it out. Bolt the neck back. It'll leak a bit but you'll be able to flush the engine. Remove top hose on engine size. Put garden hose in top hose and keep filling rad with water. Start the engine, turn on the heat and watch coolant come out from engine. Wait till it come out clear then stop engine. You should have most stuff come out this way.
Make sure you put thermo back.