Yes and for the last time you need to have a test for combustion gasses in the cooling system. A pressure test will show nothing until the leak gets real bad. Simple logic here so read and listen. Cooling system pressure is minimal. Compression pressure could be 10 to 20 times greater. So what will leak first? Coolant in the cylinder or gasses in the cooling system. Your problem is not rocket science. You most likely have never had a bad thermostat. The thermostat needs to be immersed in coolant to operate correctly. Air that traps on the spring side will not allow the thermostat to open as scheduled. Instead it allows the engine to get to warm and possibly overfill the recovery tank and blow out before it opens. Continual bleeding of the air is just a temporary fix until more air gets in the system. You should never need to bleed after initial bleeding after repairs. Get the test done.