H2O Colour
I was a bit surprised to see what I was flushing out was not that bad. It was bit darker than new coolant mixed with water. I looked down into my radiator from where the cap sits, I did not see any rust build up. Just wanted to be safe, so I flushed it 3 times just to be sure. Now my heater really blows hot air fast, that is good when winter comes around, I won't be that cold waiting for the heat to kick in.
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