>> Also, I was told by a couple list members that the system is
self-bleeding and I wouldn't have to bleed it after changing my temp sensor.
<<

"Self bleeding", Huh?

Have you bled the system at all? Did coolant come out after all the air was
purged? Did you follow one of the recommended ways of bleeding the system?
Does your fan come on when it's at 3/4?

Thanks,
Bryan