What a weekend!
One of the advantages of owning half a dozen old Volvos is that I buy my spare parts in bulk. I've got 4 spare thermostats on the shelf. As with most automotive jobs (especially those on cars nearly 4 decades old) you get the "yaoughtas" whenever you start a job. While you've got this apart ya oughta do that. We decided to flush the cooling system and replace all the hoses while we were at it. We had her all filled and buttoned up in about two beers time. We fired her up to check for leaks and admire our work when we noticed the oil leak. That was about the same time we heard the new coolant start to boil!
Yep, blown head gasket. Sunday we tore the engine down and I'll drop the head by the machine shop Monday.
As with most things I try to plan, the weekend wasn't quite what I had laid out. But good weather and helping my son with his first engine tear-down, well, it was a pretty good weekend after all.