The air conditioning compressor is the pump that circulates refrigerant through the A/C system, compressing it from a low-pressure gas to a high-pressure liquid. A failed compressor results in no cold air from the vents. Replacement requires specialist equipment for refrigerant recovery and recharging.
Compressor failures can be mechanical (seized), electrical (clutch or control valve), or due to refrigerant loss. Professional diagnosis is recommended.
Compressor replacement requires refrigerant recovery, system flushing, and recharging by a certified technician with the appropriate equipment.