How do you change air conditioning pump on 1994 impala?

To change the air conditioning pump on a 1994 Impala, first, disconnect the negative battery cable and relieve the refrigerant pressure safely. Next, remove the drive belt by loosening the tensioner, then disconnect the electrical connections and refrigerant lines from the compressor. Once unbolted, replace the old compressor with the new one, reconnect the lines and electrical components, and reattach the drive belt. Finally, recharge the A/C system with refrigerant and test the system for proper operation.