How do you replace heater core 2008 dts?

To replace the heater core in a 2008 Cadillac DTS, first, disconnect the negative battery cable and drain the coolant. Remove the dashboard and center console to access the heater core, which is located in the HVAC housing. Disconnect the heater core hoses, unbolt the core from its mounting, and replace it with the new unit. Reassemble the dashboard, reconnect the hoses, refill the coolant, and test the system for leaks.