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Dealing with the blown head gaskets aftermath

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Anyone know the best way to clean the inside of the radiator and overflow tank to get rid of the residual oil from the blown head gasket?

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FYI, I used Prestone Radiator Super Cleaner not too long ago, and man that stuff makes the coolant foam like it's a washing machine.

 

I built my own cooline system flusher with a 3/4hp pump from Harbor Freight, some PCV piping and valves, and hose, and flushed about 10 gallons distilled water through a couple times, and it was foamy like washing machine discharge. [remove thermostat, reinstall housing incl/ gasket, pump into water pump intake, collect discharge at radiator outlet] -Louis :)

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