Performed 1 system diagnostics on the upstairs AC system. I found that the furnace has a failed heat exchanger (carbon monoxide/fire hazard). The blower wheel is impacted with dirt. The blower motor capacitor is failing. The outdoor unit had a failed capacitor. I replaced the outdoor capacitor and ran the AC system. I checked the refrigerant pressures. The AC system also needs updating flood protection. The furnace and AC system was operating at the end of service call. Customer had me replace the outdoor capacitor only and setup to get an estimate to replace the furnace only.