I got a 98 Subaru Forester w/130k miles with a weird problem. The coolant overflow tank fills up over time, and if left alone will eventually overflow and then the engine overheats. I've been pretty good at remembering to pull it out then dump the coolant back into the radiator, oh, maybe once a week and everything stays fine. But I've been lazy for the last 2 weeks and yesterday it started to heat up while on the road. I pulled over (I can usually see it coming before it overheats because the temp gauge starts to bounce around), let it cool for a short time( strange but there wasn't that much pressure even though I'd been driving for a while) did my pour-back thing, added a little extra coolant to replace what had blown out the overflow and went on my way. No other symptoms, car runs fine, & coolant looks and smells clean.What gives, guys?? Please don't tell me head gasket---pretty please?? Oh hell, I can handle the bad news- give it to me straight. Thanks for your help guys- great info on the EGR problem and the wheel bearing. Glad you're here!!