Q: cooling issue

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replaced water pump gasket as it was leaking. hooked everything back up, tried to bleed cooling system, temp gauge went up higher than normal, replaced thermostat. same result. there is a knock in the upper hose that is loud and can be felt, even after the car is turned off. is this just trapped air? is the thermo not opening?

My car has 143000 miles.
My car has an automatic transmission.

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