Sigh.... well it seems I am having this same issue. Someone said they fixed it with the conditioner? Is that something to try?? I have a 2003 with 115k miles on it. This is going to be so expensive to fix and I am going to break down into tears right now. I'm going to call Subaru to see if they'll cover some. My mechanic said he's quite sure this is the problem and he's done it on Subarus before. So after it's fixed I should change coolant with every oil change and I should also add that conditioner stuff? I'm going to go get my manual and read through it, good thing I have nothing to do at work today. Though I might strangle someone.