Nissan Frontier / Pathfinder / Xterra Heater Core. The heater core is a small radiator-like unit that can be found behind the dash on the passenger side of the vehicle. Heater cores take in hot coolant that has passed through the engine and allow air forced in by the blower motor to flow through the core to produce heat for the vehicle's cabin. Heater cores can often fail and when they do you will sometimes find coolant on the passenger side floorboard.

Fits:

• 2005-2012 Nissan Pathfinder
• 2005-2015 Nissan Xterra
• 2005-2019 Nissan Frontier