Before you start breaking out the wrenches, why don't you run a block test and pressure test the cooling system? For a pressure test you only need to take the radiator cap off, and for a block test you need to take cap off and drain half the fluid in your radiator.
If you don't know what these things are just go to your local auto parts store and tell them you need a "block test kit" or a "Cooling system pressure tester".
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