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I am sorry you misunderstood me, The only place air would leak out are the cap and the fittings on the top back end of the exp tank and a foot or so of hose, as those are the only thing above the coolant level. And if the coolant level didn't drop under pressure, you are not loosing any...

I don't use pressure testers, I apply pressure using a regulator to that little hose port just below the radiator pressure cap. This way has the advantage of testing the cap in place sealed against its native surface. The radiator cap has two seals, one seals the outer lip, the other seals the...

Sorry, I misunderstood, I thought you lost 3 quarts of coolant. if engine oil was making it into coolant I think it might be darker. But snowtracks suggestion of oil from the trans in there makes sense. take a sample, heat a piece of metal with a torch and put some drops on. If there is...

what does the coolant reservoir smell like when you pop the cap? take a good look in the fuel tank, whats in the bottom? what I am geting at is that head gaskets usually put combustion gasses in the coolant which are black and sooty/greasy. A leaking injector cup seal can allow fuel and...