You should not remove the thermostat, it will cause the engine to run hotter.
Your problem will be in the overall efficiency of the cooling system. You can try a good flush, though good ones are not so available anymore.
If the problem continues, it is probably the radiator core is not flowing freely or the block has too much corrosion in the water jacket.
Never leave straight water in an engine, even overnight! Use a rust preventative.
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