Radiator leak can't find
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I've found with the engine running and coolant warm, small leaks often evaporate quickly, making them difficult to identify. I've had good results with a pressure tester on a cold engine.
If you do find an external leak, be careful with the diagnosis. The fan tends to blow any coolant around and it may collect in other spots and steer you wrong. That's why I like the pressure tester, so you're not dealing with potentially misleading results from coolant being blown around by the fan.
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