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To flush the radiator in a 1999 Mercury Cougar V6, first make sure the engine is cool. Put a bucket under the drain plug on the radiator, remove the cap and open the plug. Close the plug, fill the radiator with distilled water, then drain again. Repeat until the water comes out clean. Tighten the plug and fill the radiator with new coolant. Run the engine for about 10 minutes with the heater on high, then check the coolant level and add more as needed to complete the process.

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9y ago
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Q: How do you do a radiator flush on a 99 mercury cougar V6?
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