Join Date: Jan 2003
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Re: What Is This Coolant Crud ?........
Aluminum material has a thin surface layer of aluminum oxide, if you remove this layer and expose virgin metal a layer of oxide forms in seconds, using oxygen from the air. This can be scrubbed away by the solids in tap water circulating within the cooling system and accumulate along with the other impurities (iron, copper, sand, lead, tin, zinc, chlorine, phosphates etc.) from tap water to produce the sludge you see here. I think the block, heater core & radiator act like sacrificial anodes and over time release material as well. I've seen iron blocks that have been neglected produce so much rust in the cooling system that the coolant looked like red paint draining from the hoses! I go a step further than distilled water and use water filtered via reverse osmosis then de-ionization resins. Run it for a week then change it out & you'll get more crud than you can imagine flushed from the system but may spring a leak in any weak corroded spots. This water is so pure it's not recommended for drinking. I think JerseyZuk said Walmart sells reverse osmosis water but this has not been post filtered via the DI resins.