[btimbit]

Thanks, definitely good comments to add.

What I personally do is a flush or two with just tap water then a final one with de-oionized before the final fill with coolant. I've never had an issue and figure whatever tap water might be left is too little to worry about, but what you've said is definitely the proper method.

I'll also add something I forgot before, but don't just grab any coolant off the shelf, you want to make sure you use the right stuff for your vehicle. Some use OAT coolants to prevent corrosion on vehicles with more aluminum parts, but you also don't want to mix different types together. Coolant is one thing I still always get from the dealer, it's rarely more expensive than no name brands from Canadian Tire and you can know it's the right stuff