Cooling system

How hot does it get in degrees F? Is the coolant reservoir filling up in a hurry? Is the radiator cap okay? With the work you have done, maybe air in the system? Does the radiator fan work? I saw what you replaced, I would still want to check coolant flow. Sometimes a head gasket can cause problems.

On some makes and models, I remove radiator cap, cool engine. Start engine, if coolant level in radiator starts rising quickly, then I start worrying about a head gasket, but, I check everything else first.

Do a pressure test on it as well as a combustion gas test. If it will not hold pressure and you do not see a leak and it fails the gas test it would point to a failing head gasket or similar.