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If you can find no outward leaks, and you are sure its not being blown back into the overflow reservoir by a bad radiator cap, the only other explanation would be a blown head gasket, but if that were the case you would see white smoke from your exhaust, and smell a sweet smell from your exhaust. check all hoses and other possible locations for leaks before exploring the head gasket, many people lose their coolant through bad radiator caps while they are driving and never realize until its too late, it will spill out the overflow on the road and virtually nothing while sitting still.

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Q: Why can't i keep coolant in the radiator even after replacing freeze plugs?
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