So this vehicle is leaking coolant. And I couldn't see where the leak was coming from when looking over the hood or under the car, but it looked like it came from the water pump. I got the water pump out of the vehicle and I was about to replace it with a new one that I got along with a new thermostat but then I started thinking about how the vehicle only seemed to leak while the engine was running.
Looking online, I read that the water pump will even when the engine is off, which I don't think happened with my vehicle.
So what parts of the vehicle will leak only if the engine is running? Is it likely that the water pump is not the problem?