Often the plastic breaks and water/coolant enters the pump motor area. That is usually the end of the story for the pump.
Good Luck with your pump. Anyway, it is not that important, just makes the temperature inside the car a bit more stable when car runs at idle or when you have to stop at a signal.
Replaced the one on my car last summer after 16 years in operation.
It may rest in peace, has done it's job.