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It could be a air pocket but air should not have gotten into the sealed system, You can take the thermostat out and check it in a pot of boiling water, Check you tube and you will see videos about it, But honestly if I was taking it out I would be replacing it anyway.
I would also check to see if your fans are coming on at the correct Temp and if both Hi and low speeds are working. After you change stat and verify everything is good I would make sure to flush system and put correct coolant and ratio back in.
And just for good measure I would put new radiator cap on.
I believe after this you will be good to go. Usually if water pump goes bad you will see coolant weeping from it and it will slowly get noisy.
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