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You can get the old coolant out of the block by exchanging it for
water. A couple of fills and drains ought to do it. Or you can do
it by trickling water in at the top while letting it out at the
bottom, with the engine warmed up and running, until it runs out
clear at the bottom. Then shut it down, drain it as completely as
possible, button it up and refill it with the coolant of your choice<b>
after it cools down. </b>I used to flush out rusty coolant this
way when I was into flipping cars to raise hobby money. <br>
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CR<br>
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