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First I eye-ball the radiator and all coolant related parts then if the leak isn't obvious I pump 15 psi of air pressure into the cooling system with a cooling system pressure pump. This usually helps locate the source of the leak.

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8y ago
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8y ago

Pressurize the cooling system. If you see coolant leaking out, you have a leak. Use a flashlight to determine where it's coming from. If the coolant is leaking out through the radiator fins, it's a leak in the radiator. Harbor Freight sells a pressure tester for ~$85, or you can probably rent one from an auto parts store.

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Q: How do you diagnose a radiator leak?
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