The radiator is aluminum but the heater core is not I don't think...Its aluminum and plastic. Not sure that acid is a good idea.
I needs me some fluroantimonic acid. Time to protonate some hydrocarbons!Muriatic acid is just a shelf name for hydrochloric acid. Not only does it eat aluminum, but the chemical products are pretty nasty as well. I would know, as a kid I made 2 liter bottle bombs with the stuff all the time.