Possibly normal if the engine bay got alot of coolent spilled on it during replacement of the radiator. Try cleaning out the engine bay then let it dry up. After go drive the car like you normally would. If you still have the smell a few days later, then go under the hood look for leaks. If you cant find any leaks then try flipping back and forth from heater hot to a/c cold. If it still smells when on a/c cold it most likely is not your heater core. But I would not count it out. From their it's up to you what you want to do.
good luck on it!
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