Q: How to Replace an Air Conditioning Compressor?A: Have an AC technician discharge and recover the system refrigerant, disconnect the negative battery terminal, and remove the compressor drivebelt. Set the parking brake, block the rear wheels, and raise the vehicle's front, supporting it on jackstands. Disconnect the compressor clutch electrical connector and refrigerant lines, plugging open fittings to prevent dirt and moisture entry. Remove the compressor mounting bolts and guide the compressor out from below. If installing a new compressor, drain excess oil as per instructions. Transfer the clutch from the old to the new unit if necessary. Installation is the reverse of removal, using new 0-rings (coated with refrigerant oil) at line fittings. Have the system evacuated, recharged, and leak tested by an AC technician, then reconnect the battery.