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I would try your temperature sensor/sending unit as well. They're $10-25 for a decent one. It's in the thermostat housing, so it might be easier to replace it once the coolant is already out as you're doing the thermostat.
Don't forget to squeeze the upper radiator hose and get air out of the system. It will overheat your engine and ruin your coolant.
Don't forget to squeeze the upper radiator hose and get air out of the system. It will overheat your engine and ruin your coolant.