I preformed an AC tune up today, the whole system is 21 years old, the blower is dirty and is getting unfiltered air, the static is bad due to a small coil making a choke point, the contactor has bad burning and pitting on it, the cap is reading 9% out of range, and the fan is leaking oil. The customer wants to keep the system going for another year or to before replacing, i recommended replacing the cap and possibly cleaning the blower to help that happen. AC was running when i left.