Start by removing the negative battery cables from Stanza and 240SX vehicles. First, find the condenser retaining bolts and unfreeze their access by taking away the hood lock stay and radiator grille. Also, remove the condenser fan motor if needed. Get rid of any cold air inside the system, disconnect the condenser refrigerant lines, and keep them plugged with a clean dry rag. Then, unscrew the mounting bolts around the condenser and carefully take it out of your vehicle. Put the condenser back into its place, and tighten all mounting bolts with an even hand following the manufacturer's instructions. Use fresh O-rings when attaching all refrigerant hoses, and carefully reconnect those same hoses. Restore any parts you removed from the mounting bolts area, including the condenser motor. Attach the engine's negative battery wire, empty the system's air, and add new fluid precisely as needed.