On many sleds you just disconnect a lower coolant hose and open the filler cap. You will need a big drip pan to catch it. You may also have an air bleed fitting on the coolant pump intake side. It always seems to be a mess...[xx(]
I just undo the small clear hose that comes off the large black hose on the front of the engine, and returns to the overflow jug. Where it unhooks in front, I put a spare piece of hose on the fitting and use it to drain the antifreeze into a bucket. Be sure to open the filler neck cap as well. No mess.
Of course this doesn't "power flush" the enitre coolant system, there's still some in the hoses and running board heat exchangers. But it does get quite a bit of it out.
Just a word of caution, if you plan on using the orange antifreeze (GM DexCool) make sure you chemically flush and rinse your cooling system several times before you put in DexCool. DexCool does not mix properly with green antifreeze and may turn to a brown sludge. There is also documentation that indicates that when the two types are mixed there is the possibility of an aluminum corrosion problem. It is recommended not to use Dexcool in a system that did not have it orginally installed. It's best to use the antifreeze recommended by the manufacturer.
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