[bnoon]

Originally Posted by Tx Firefighter

If it runs real smooth and your oil isn't milky, its probably something external and minor. Water pump, leaky hose, radiator.
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Gotta check the plugs too because I've had the head gasket leak into a cylinder without leaking into the crankcase, but if it drained the entire cooling system it's more than likely an external leak anyway. Good luck!