Radiator shops can do flow checks, that or when i check my radiator I put the garden hose up to one end and make sure it flows out the other side pretty easy when laying flat on the ground. Not very scientific but I at least know it's not badly blocked. If you poor hot water into it, the fins should have a fairly even temp across, if one section is hot and another section is cold that would indicate a blockage.
Don't forget to
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first then ask questions later! The loose nut behind the wheel