If the cap is 16 years old, replace it. The bottles seldom crack. The small hose is cheap but it probably doesn't leak either.
I wonder why you didn't replace the top hose when you replaced the bottom. If you replace it, get new clamps. Also measure the distance from the radiator to the clamp and make sure the new clamp is the same distance - the plastic tube from the radiator does not like to have clamp spots. AND, do not over tighten the clamps at the radiator end.
Have you checked the heater core for leaks? Or the water pump gasket?
Klaus
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