Where is the heater core in a 2004 Nissan Quest?

In a 2004 Nissan Quest, the heater core is located inside the vehicle's dashboard, typically on the passenger side. Accessing it usually requires removing the dashboard and various components, as it is situated within the HVAC (heating, ventilation, and air conditioning) unit. It's important to consult a repair manual or seek professional help for this process, as it can be complex.