The cooler line flush can be done by 1 person, although a second person helps. I put an empty milk jug where I could see the top, ran the cooler line extension to it, hopped into the drivers seat, and cranked the car until the jug was full. The size container to use depends on your transmission's capacity. Some Honda transmissions take about 5-6 quarts of ATF while my Buick takes 14. So 4 quarts low wasn't too big a deal for me.
For your car I'd pump out the pan several times over the next few thousand miles, assuming you have a dipstick to check ATF level with. This will get the gum and varnish out and new fluid in.
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2012 Chevrolet Cruze Eco 6MT
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