Disconnect the negative battery cable
Recover the refrigerant with proper HVAC equipment
Remove the drive belt
Disconnect the electrical connector from the compressor
Disconnect the refrigerant lines from the compressor
Cap or plug the open refrigerant lines immediately
Remove the compressor mounting bolts
Remove the old compressor
Drain the old compressor oil
Compare the new compressor with the old compressor
Add the correct type and amount of compressor oil to the new compressor
Install new O-rings or seals on the refrigerant line connections
Install the new compressor
Tighten the mounting bolts to specification
Reconnect the refrigerant lines
Reconnect the electrical connector
Reinstall the drive belt
Reconnect the negative battery cable
Evacuate the A/C system with a vacuum pump
Recharge the system with the correct refrigerant amount
Start the engine and check A/C operation
Check for leaks and abnormal noises