How do you replace heater core 1993 geo storm with air condictioning?

To replace the heater core in a 1993 Geo Storm with air conditioning, first, disconnect the negative battery terminal and drain the coolant from the radiator. Remove the dashboard, which involves taking out the instrument panel and any necessary trim pieces. Then, disconnect the heater hoses from the core and remove the mounting bolts to extract the old heater core. Install the new core, reassemble the dashboard, and refill the coolant before reconnecting the battery.