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The first thing to check is if the coolant is at the right level and then you will need to replace the thermostat. The thermostat is old and probable sticking closed but also the water might be freezing in the car around the thermostat and causing it to stick closed. One thing that you can do to stop that is buy strait antifreeze and add water yourself buying fifty fifty mix is not good it is 25% coolant and 3/4 water. When you mix your self you can get a good fifty fifty mix that will not freeze. The coolant that you are loosing is coming from the over flow tank so keep it full. Replace the Thermostat every year and a half will make sure that it will never ware out and stick again.
If your having to put that much water in it I would lean towards a bad head gasket your other symptoms would make me think possible water pump. I'd check them both 1 of the 2 is most likely the prob or possiobly both. Good luck.
Check to see if you have flow through the entire radiator.If part of the radiator core is cool to the touch when the engine is at operating temp, this indicates restricted radiator flow. If the entire radiator core is not allowing water to flow through, cooling will not be at all efficient. Also a good idea would be to purchase a block tester. available at napa and other reputable parts houses for around thirty dollars. You remove a small amount of coolant, and put the tool in the radiator, or pressure tank opening. If there are any combustable gasses present, i'e' exhaust, this would indicate a head gasket breech, (or maybe worse) and would indicate that it's time to stop looking for a simple problems, and get proffessional help. Good luck to you!
It sounds like the the thermostat that was replaced is probably faulty. This being the cheapest and easiest to do I would start there. I can't reply about the air pockets. I have never heard of that before.
The cylinder head gaskets are leaking, u will need them replaced, the heads checked for true and the oil pan flushed to get the water/coolant out, make sure u figure out why it overheated before any repair begins or the same thing will happen again.
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