How do you change the heater core in a 96 Oldsmobile bravada?

To change the heater core in a 1996 Oldsmobile Bravada, first, disconnect the battery and drain the coolant from the radiator. Remove the dashboard components to access the heater core, which typically involves removing the center console and possibly the steering column for better access. Detach the heater core hoses from the engine bay, unbolt the heater core from the HVAC unit, and replace it with the new core. Finally, reassemble everything in reverse order, refill the coolant, and check for leaks.