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When you buy the test kits you have to buy a special fluid for diesel engines. They don't have less CO2 in their combustion products than gas engines. With that said, the only time I have tried to use a kit was on a Cat 3512 that was blowing bubbles. The test never indicated anything. We used...

That's exactly what my 6.2 was doing. It would push coolant into the reservoir when running but would hold pressure for months when the engine wasn't running. This kept it from pulling coolant from the reservoir. It ran this way for quite some time but gradually got worse. Disassembly revealed...