I've never been able to get this housing to seal completely and I've been trying for 37 years. It always seeped a little coolant and it was getting worse. Thanks to this forum, now, I know why.
I found several related threads here and learned several of you reported your housings were warped. So, I decided to used 600-grit sandpaper on a flat surface to make see if my housing sealing surface was flat. Sure enough, it was a bit warped, so I sanded, and sanded, and sanded as the sealing surface trued up and shined up. Once it was nice and shiny, I saw the problem. The housing has a fine crack between one of the bolt holes and the housing dome, running right through the sealing surface. No wonder it always leaked.
So, $5.49 gets me a new housing through Advance Auto. I'll put a new Stant SuperStat in the housing and should be good to go.
On to the next challenge.
