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What I do is flush the system; 'cause if your rad has corrosion, so does the rest of the cooling system. Purchase a PRESTONE flush kit at a auto store along with a container of flush and at least a gallon of antifreeze. There are detailed directions on the package. Briefly, you will be installing a flush tee in the return hose to the heater core, adding a can of flush to the rad,running the car at idle and then attaching your garden hose to do the work. Very effective.

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18y ago
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Q: How do you flush the radiator on a 2000 Honda Civic?
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