Last year, my daughter bought a 2007 Forester (still under factory warranty). We noticed the coolant was very low last year (overflow container was completely empty when hot), and took it down for service. They said the radiator cap was bad and replaced it.
We are still having the same problem. She took it down again, and they drove it on the interstate, and pressure tested it, and said they could not find any trace of a leak -- pressure test was OK. They suggested she was overfilling the overflow container.
When it is warm, I can smell antifreeze. The last time she filled it, she had to not only add coolant to the overflow container, but also an little to the radiator.
Would a problem with the head gasket show up during pressure test? It runs at normal temp -- no overheating problem.
I remember J.C. Whitney used to sell kits that you could add a dye that would show up under black light, where it is leaking. Maybe I could find a private garage that could do that?
Suggestions?
Jim