How do you replace the heater core show video?

To replace a heater core, first ensure the vehicle is cool and disconnect the battery. Then, drain the coolant and remove the dashboard components as needed to access the heater core. Disconnect the heater hoses and any mounting hardware, then carefully remove the old heater core and install the new one, reversing the process to reassemble everything. Make sure to refill the coolant and check for leaks before testing the system.