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I have a 2011 stock mazdaspeed 3 in which I have a coolant leak from the back side of the engine it appears. This leak does not happen all of the time but usually overnight because I notice it the next morning on the ground. I have tried to see if any of the hoses are wet and I have not seen any went hoses so I am quite confused on where this leak in coming from. Has anyone else experienced this type of coolant leak where it only happens here and there and not consistently that could point me in the right direction? Thank you!
 

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My drain plug on my radiator started randomly leaking. Replaced the plug with the o-ring, and still leaked. I wound up replacing the radiator itself, and that fixed it.

I'm definitely not saying that's your problem, but it was mine.
 
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