1 system ac tune up complete. Changed filter. Tested mechanical and electrical components. Found system with very dirty blower wheel and dirty evaporator coil. Found mold in system. Found evaporator coil to be rusty and corroded. Found compressor capacitor (40 uf) to be weak. Found outdoor fan capacitor to be weak (5 uf). Found main electrical switch to be burnt. Wiped down condenser electrical cabinet. Chemically washed condenser coil. Due to age and condition of system, recommend upgrading system to a more reliable and more efficient system. System is cooling at this time.