Quote Originally Posted by DomHarris View Post
my first question is can I add tap water to the rad, only till I flush it or buy more coolant,
Yes, but distilled water is recommended. With that being said, I've always just used tap water; if it's good enough for me, it's good enough for my vehicles. LOL



and the second question at 180,000 can I completely flush out the dexcool and replace with green coolant?
Yes. I'm not a fan of Dexcool and use regular coolant. You must flush thoroughly so all the Dexcool is out.