If the gasket fails either from age or damage from dirty coolant you will see a leak where the water pump bolts to the block or timing cover. If the water pump bearings are starting to wear out they will allow the shaft to wobble and coolant will leak out. Water pumps can leak from 2 different places the shaft seal or the water pump gasket. If this is the case you will need a special tool to hold the fan and water pump pulley stationary while you loosen the nuts holding the fan onto the pulley. If you’ve got a truck or rear wheel drive vehicle then there is a good chance your water pump is connected to a mechanical cooling fan.
If your vehicle has a timing belt, there is a good chance the water pump is actually driven by that timing belt so changing the water pump includes removing timing components which is always a tricky job with disastrous consequences if you don’t get things back together correctly.
Fixing a water pump leak may sound simple when you first see drips of coolant under your car but depending on the water pump location it could be a relatively difficult job.
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