Bummer...
If you have to drive and do not have time or want to do the HG do what Subaru does...add coolant conditioner every 48000kms in Canada or as Subaru USA has done by giving you an eight year 100,000 mile head gasket warranty.
http://forums.nasioc.com/forums/show...hreadid=488157
Many auto makers add conditioners because of our very problem, they know that their gaskets will fail.
I know some of you dislike Bars Stop Leak but this shite works and will get you home. Added two containers to my rad in order to buy time before the HG job and neither the rad or heater core suffered.
Had a look at the Sube Conditioner and bet that this will work quite well, mind you I'd be adding at least three of the little containers because our systems are huge by comparison.