If a 2000 Sebring convertible ran hot and now will not hold even small amount of water did the engine crack or was it be pump?

A 2000 Sebring convertible overheating and then losing all coolant points strongly to a cracked engine block or head gasket. While a bad water pump *could* contribute to overheating, it wouldn't usually cause a complete and sudden loss of coolant unless it resulted in a catastrophic failure that also damaged something else (like a hose bursting under pressure).

A cracked engine block or head gasket allows coolant to leak into the cylinders or oil, resulting in the loss of coolant from the system. This is much more likely than the pump alone being the sole cause given the symptoms.

You need to have a mechanic diagnose the problem. Trying to guess without proper inspection could lead to costly mistakes. They can perform a pressure test on the cooling system to pinpoint the leak.