By the time the water pump on a vehicle needs replaced it would be a good idea to replace the thermostat as well as the coolant hoses including the top and bottom radiator hoses and the heater hoses as well as the serpentine belt.
The thermostat for a vehicles cooling system doesn't cost all that much and if I were replacing a water pump and hoses I would go ahead and replace the coolant thermostat as well.
If the thermostat gets stuck closed then it could cause the engine to overheat.
The average life of a vehicles water pump is between 100,000 to 300,000 miles or 10 to 20 years.
In most cases the water pump on a vehicle will sometimes last the life of the vehicle but other times the water pump might need to be replaced.
A water pump will usually start leaking or making squealing noises when the engine is running.
A vehicles water pump rarely fails but they can and sometimes do but usually they last 10 to 20 years and between 100,000 to 300,000 miles.
When a vehicles water pump goes bad it will fail to circulate the engine coolant to keep your engine cool.
So your engine can and will overheat due to failing water pump.
Water pumps that fail may also make a squealing noise which means the bearings in the water pump are failing and you should replace it.
A water pump will also usually start leaking when it fails because of the seals in the water pump failing.
Water pumps that are belt driven are pretty simple parts because they are just basically an impeller being spun on a bearing by the belt.
A water pump should last for 100,000 to 300,000 miles as long as you keep the cars cooling system maintained and don't run the water pump dry.