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A coolant leak while the engine is running is likely in the water return hoses. The vehicle can be standing still and in park, but with the engine running the fluids are still being pushed through the system to keep the engine cool. The water return lines generally run from the top left of the radiator when you are standing at the front of the car looking at the engine. Any leak in that system will likely not continue once the engine is stopped as the fluid no longer is pushed through the system.

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Q: Why does coolant leak after running your engine but not while driving?
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