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Originally Posted by Brian Carlton
Citric acid will clean the entire system and remove the accumulated rust.
However, the heat offered by the heater core is usually sufficient despite the condition of the cooling system. It doesn't make a lot of sense to do a citric acid flush for the benefit of the heater core. If you have overheating problems and suspect accumulated rust in the block and corrosion inside the radiator, then the procedure makes some sense.
It's not a panacea, however. Sometimes the components need replacement and the citric acid simply won't cure the problem.
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Ahhhh. I'm clueless enough that I thought that the engine coolant circulated throught the heater core and that inturn, you'd be reconditioning the heater core with a citric acid flush of the coolant system.
Thanks.
P.S. No known problems with the heater core so far, and the cooling system works fine. I'm just thinking of replacing it as a preventative measure so I don't have to think about it for as long as I own the car.