Hi all, I'm going to be replacing my radiator, upper and lower hoses. While shopping for the parts on RockAuto, a 3rd hose was shown called a "Bypass" hose, part# ACDelco 14155S. I'm not sure what this is for, where it's located, what it connects, and if I should be changing it out with the upper and lower while I'm at it.
Any help would be appreciated.
Thanks,
Chris