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I noticed there are few drops of coolant on the garage floor. The position is corresponding to the coolant drain plug. Does the drain plug have an o-ring? I tightened the drain plug but no luck. Anyone has experienced the same issue and what would be the fix?

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I expect that there is an O-ring. But to get at it, you are going to drain a lot of coolant unless you seal off the discharge with a plugged piece of hose, and also plug the drain valve opening with something while you figure what to do with the seal.
 

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The radiator drain can get fouled with any small particles in the coolant. You can try opening the valve for a few seconds to try to flush the particles out. I've had that happen and was able to flush it out by opening the valve for enough flow to clear it.
 
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