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 wee…

98 Subi coolant overflow tank keeps overflowing

texases May 18, 2012, 4:11am 4

Blown head gaskets are common on 2.5l Subarus of that age, like your Forester. Follow Tester’s advice. Also, shops can check the fumes coming out of the radiator for exhaust.