there was a post about vc-9 a day or so ago that I provided the flush info for. do a search for vc9 and read that. also simple green or cascade both work well. do not use any soap/ cleaner that foams. I would advise to take the radiator and have it flush at a radiator shop. Also if the heater core can not be cleaned is should be replaced. they not bad like $80.00 for them and easy to install
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