How to fix heater core dodge nitro?

To fix the heater core in a Dodge Nitro, first ensure the vehicle is safely elevated and the engine is cool. Begin by draining the coolant, then remove the dashboard and any necessary components to access the heater core. Disconnect the hoses and remove the old heater core, replacing it with a new one. Reassemble the vehicle, refill the coolant, and check for leaks.