When I bought my car and started working under the hood I found this:
Well I wasn't too happy about that, but it was no big deal in the winter. Now that summer's coming though that needs fixed ASAP. I know I need to get a nut and a gasket and bleed & refill the coolant, but should I do anything else considering it's been sitting detached like that for who knows how long?
Also, I think I can pull a nut from a junkyard, but where's the best place for a new gasket?