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Take a 5 gallon buck and fill it half way up with the hottest water you can get your hands on. Dump plenty of toilet bowl cleaner in the water - the kind containing hydrochloric acid works the best. Submerge the heater core in the water. Be sure to check on it periodically because if you leave it in the water too long, the acid may dissolve too much of the metal and create a pin hole. It usually takes about a half an hour.
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"Restoring A Heater Core For Use As A Radiator"
Jeffery Evans - 11/22/00
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