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...can this be done without draining the coolant ?
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Yes. It will be a little messy, but you have intermix already. You can minimize the mess by lowering the level of coolant in the expansion tank. I've used a turkey baster for that (do not use it for basting turkey afterward).
In most cases of intermix the problem will turn out to be a cracked head, especially in 2000 models. I actually did have one that was bad O-rings on the oil cooler though.
Hoping for the best.