How do you replace the heater core in a 2006 suzuki forenza?

To replace the heater core in a 2006 Suzuki Forenza, first, drain the coolant and disconnect the battery. Remove the dashboard and any necessary components blocking access to the heater core. Disconnect the heater core hoses and mounting bolts, then carefully remove the old heater core and install the new one. Reassemble everything in reverse order, refill the coolant, and check for leaks.