Hello Mike, I was referring to bleeding after I put the new T-stat on. There will be so much air in there and I was worried. So, you also agree that teh correct way to bleed is to let the car run while leaving the cap off?

BTW, why did you not like the "boil in a pot" test? I don't really know how T-stat works but it is surely amazing. Especially these MB two stage T-stat.