[bestgenman]

Bill, look again at Steve's drawing, it is different than the tubes you were refering to wheras Steve's drawing is correct and I believe the return you have pointed is the return from the engine heating circuit. Just so you don't diagnose incorrectly down the road and cost you a bunch of cash!

I noticed my overflow tank not changing level when cool or hot and the cap was also bad however a new cap didn't help. I found the top of the tank neck uneven from old gasket etc. After cleaning with scotchbrite, it began to work properly. The lesson learned is: the cap and overflow cannot have any air leaks!!

Also, be sure to check the PH of your tank mix, it should be well above 7, even up to 9 is fine. If it goes acidic it can ruin the tank. ( another lesson learned from experience!! )

Gordon