How do you replace the heater coil in a 1996 Oldsmobile regency '98'?

To replace the heater coil in a 1996 Oldsmobile Regency '98', start by disconnecting the negative battery terminal and draining the coolant. Remove the dashboard and any components obstructing access to the heater core, such as the center console and HVAC housing. Disconnect the heater hoses from the core, remove the mounting screws, and then carefully extract the old heater core. Install the new heater core by reversing the removal steps, ensuring all connections are secure before reassembling the dashboard and refilling the coolant.