Motor Vehicle Maintenance & Repair Asked on January 28, 2021
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?
The water pump tends to leak (more in some cases, or only in some cases) when the engine is running due to a few reasons:
the pump causes a pressure difference in the system
the cooling system becomes pressurised due to temperature to above atmospheric pressure
the rotation of the pump shaft acts on the seals and if the bearings have failed the shaft wobbles
Any of these or all will make the leak at the pump apparent and it can be severe in some cases or just a small dribble in others.
Correct answer by Solar Mike on January 28, 2021
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