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What’s the proper way to do a coolant flush? Do you just drain and fill? I’ve seen YouTube videos where they drain, fill with distilled water, run it for 10 minutes with heat on, drain water, repeat fill and drain with distilled water and finally fill with new coolant.
 

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09 Altima 3.5SE 6MT Sedan
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I'm a drain and refill kind of guy. You get enough new additives in for lubrication and anti-corrosion without having to get more complicated than that. Unless there's a reason to flush the system (ie incompatible coolants mixed together, or post engine work, I wouldn't.
 
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