[Perfectlap]

If you flush, you need to have the newest coolant cap from the dealer (if you haven't already updated it). That's one part I wouldn't try and get from Ebay. Not worth the savings.
And if you are doing the fill old school (no airlift) make sure its burped good, check the coolant level constantly in the trunk. If all the air isn't out and you're on the original coolant tank (by now old and brittle), you'll likely be in for another coolant flush, an unexpected one.