A car AC compressor can often last 8 to 12 years or longer, but its lifespan depends on vehicle age, use, maintenance, climate, and the overall condition of the AC system. The compressor is the pump that moves refrigerant through the system, so it works whenever the AC system is operating. Low refrigerant, poor AC lubrication, contamination, electrical faults, or ignoring leaks can shorten AC compressor life. Signs of compressor trouble may include warm air, unusual noises, AC compressor clutch problems, metal debris in the AC system, or pressure readings outside the normal range. A compressor should not be replaced based on symptoms alone. A proper AC diagnosis helps confirm whether the compressor has failed or if another issue is causing poor cooling.