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I replaced the cap but it's still doing it so dose that mean it's the gasket or what else could it be.

I traced the leak back to the over flow line coming out of the the motor. Thinking it could possibly be the head gasket going bad. Witch sucks because the wheeler has such low miles but it sat a lot the guy only used it for snow plowing and deer hunting.

I have a 1995 xplorer 400 with 650 original miles it runs like a top. but it is going through coolant. it's not over heating or blowing white smoke so I think it's leaking somewhere any ideas on how I could check for leaks would be greatly appreciated.