How do you replace a 1992 Cabriolet heater core?

To replace the heater core in a 1992 Cabriolet, start by disconnecting the battery and draining the coolant. Remove the dashboard and HVAC housing to access the heater core, then disconnect the heater hoses and any mounting screws. Replace the old heater core with the new one, reassemble the HVAC housing, reconnect the hoses, and reattach the dashboard. Finally, refill the coolant and check for leaks before reconnecting the battery.