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if it only leaks during starting then thats really strange. but if you have a leak some where, then when you turn engine over it will turn water pump that will pressurize engine. if it leaks while running the engine then be careful and try to find source of the leak, it is most likely a bad seal, having bad seals is really really bad, it could leak into oil, not good for lubrication, find the source of your leak, or if its small enough leak, then put some stop leak threw it i wouldnt trust it farther than you can throw it, but if it works then i would suggest replacing all of your coolant to be on the safe side

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Q: Why would Engine coolant leak when starting engine?
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