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Message: <blockquote data-quote="Gavin Allan" data-source="post: 981327" data-attributes="member: 60736">If you are losing pressure, then the next challenge will be to hunt down the leak.  It sounds to me that you might quite possibly have a blown head gasket that is allowing the air/fuel mixture from one or more of the cylinders to be pumped into the cooling system.  This is a frequent result of overheating.  There are other things that could be going on too.  A quick test you could probably do right now would be to fill the radiator, leave the cap in the 1/2 position (venting the cooling system freely to the overflow hose, and unhook the overflow hose from the recovery tank and insert the end of the hose into a glass of water.  Run the engine and watch for bubbles coming out the end of the hose in the glass.  If you got bubbles, you got an internal leak (blown cylinder gasket, cracked head or block, etc.).</blockquote>