There are A couple of things that can happen, ALL BAD. Here is A short list: Pump can lock up, If it locks it can break the drive belt and allow the engine to overheat, Pump can ruin the seal, seal failure can allow all the water to be lost, engine will overheat, The shaft on the pump can break and the pulley or fan if its attached can come off and ruin radiator, << If the water is lost or stops flowing the engine can get too hot before you can stop the car, even if you stop immediately. >>You would be surprised at how effective the water is at removing heat, thus NOT REMOVING heat it if its not working.
no.
You cannot repair the water pump. It needs to be replaced.
Test your water for TDS and calcium hardness to decide if water needs to be replaced.
It can be something as simple as that they are broken and needs to be replaced. Or the internal spring holding it could have worn out as well and also needs to be replaced.
Fresh water might run out.
Your car will most likely overheat because the water will not circulate properly
The thread on the tap has broken and needs to be replaced.
The head gasket has blown and needs to be replaced.
There is a small hole in the bottom that is designed to leak when the water pump bearing is goin out
If it is water you have a plugged condensation drain line that needs to be cleaned out. If it is engine coolant you have a leaky heater core that needs to be replaced.
No actual life expectancy, when it needs replaced, replace it.
No, that noise means there is air in the system which needs to be bled, then replaced with water.