This does sound like a head gasket issue but one of two tests will confirm it. The first one works if you see air bubbles entering the coolant reservoir and it may work even if you don't. With the engine running, air is drawn from the radiator through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are present the liquid will turn bright yellow.
The second test is to add a small bottle of dark purple dye to the coolant. After running the engine for a while you search with a black light. The dye will show up as a bright yellow stain that you can follow back to the source of the leak. If the head gasket is leaking you'll find the dye inside the tail pipe.
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Friday, June 28th, 2013 AT 9:23 PM