Originally Posted by mod maniac
Subaru makes a coolant additive that is for external water leaks and it works. I have used it on many customers cars with no problems. I would use that before you hurt something.
I suggest you do some searching here before you too aggressively encourage people to use the additive instead of actually fixing the real problem. That was Subaru's fix before they were willing to admit they had an actual head gasket problem on these engines.
There were a lot of clogged up radiators and cars that overheated from that stuff and needed a lot more work than just a head gasket job. That stuff is junk.