How do you replace expansion valve rear AC 1999 gmc safari?

To replace the expansion valve on a 1999 GMC Safari rear AC, first, ensure the system is decharged and disconnect the battery. Remove the rear AC unit's access panel, then locate the expansion valve, which is typically situated near the evaporator. Disconnect the refrigerant lines and electrical connectors from the valve, then unbolt it from its mounting. Install the new valve, reconnect the components, and recharge the AC system before testing for proper operation.