with the engine running and the radiator cap off, look at the coolant and if you see a lot of bubbles, it could be exhaust leaking into the coolant=bad head gasket. You can also pressure test the cooling system as well as the radiator cap to see if either of those are leaking. Check at your local auto parts store, some will perform this kind of test for free.
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so much to do, so little time.....at least i aint bored.
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