AC compressor replacement is a moderately complex job that requires recovering and recharging the refrigerant, which must be done by a certified technician with proper equipment. The job typically involves replacing the receiver/drier or accumulator, flushing the AC system to remove debris, and adding fresh compressor oil. If the old compressor failed catastrophically, metal debris may have contaminated the entire system, requiring condenser replacement as well. Labor time is typically 2-4 hours plus refrigerant service.