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cleaning coolant over flow tank

  1. Question about flushing coolant system

    C6 Corvette General Discussion
    I'm flushing my coolant system with water. My over flow tank is pretty dirty with this greenish film on the inside. I have it out of the car and have tried hot water, vinegar and running out of ideas to clean this and get it looking like it did new. Is that even possible? What can I use to...
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