I held off putting my system together after reading a few of these - then I headed here to Orlando to take my wife to Sea World; she's in the shower so I only have a minute to reply here. I'm glad I waited to get the spring before I attached the lower hose and filled up the system. For NO other reason other than NEVER having doubt or to wonder if I do end up with a overheating problem, that if its because I didn't have spring. Sorry you got flamed and I brought up "old memories" in here - I do THAT enough with the wife!
I'll be back tonight after Sea World to see how things are going in here!

Thanks everyone!