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I believe what G.M. is saying is.... if you have/had compression leaking into the cooling system, this could cause some or all of the problem you are having. You might be able to remove the radiator cap and see the compression bubbles surfacing in the top of the tank, or if you hook up the recovery bottle he mentioned, you might see these bubbles coming up through the recovered coolant there. The Barrs Stop Leak may stop the compression leak.