If there is no leak, the system will not need oil or refrigerant. If you added these, you either have a leak that you need to fix or you now have a system with the incorrect amount.
How old is the belt? If the belt has 76K consider replacing it, but only with an authentic Subaru belt. Check the roller while the belt is off, maybe it's making noise; if so, replace that too (NAPA would do for that but not for the belt).
Don't run the system with a leak or with incorrect pressures (over-topped).