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Re: flushing the cooling system
Shops use a machine that forces pressurized coolant in and collects the old as its pushed out.
If this is just a maintenance thing, pull the lower radiator hose and drain out what you can before refilling. I use compressed air through the radiator cap to get a little extra out.
If you have a blocked cooling system, there are many flush chemicals out there but you'll have to do a more complete drain.
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