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The best thing to do is to get a pressure tester. This pressurizes the coolant tank and if there are leaks than it will show. If it's a bad headgasket then the test tokendog mentions will detect it. There isn't always coolant and oil mixing with a bad headgasket.

There is also the EGR cooler. This is a heat exchanger between the exhaust and coolant system. If it's leaking into the exhaust you should smell it in the exhaust and notice a slow loss of coolant.
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