Genuine Nissan Quest Heater Core

Nissan Quest Heater Core Parts Questions & Answers

• Case Assembly-Heating Unit
  27120-0B000
  Q: How to remove and install a heater core in a Nissan Quest?

  A: Disconnect the cable from the negative battery terminal and drain the cooling system. Disconnect the heater hoses from the heater core inlet and outlet tubes at the firewall. Remove the center dash trim panel, console cover, two lower side panels, radio, heater/air conditioning control panel, glove compartment, and both left and right below-dash covers. Remove the heater floor duct, upper duct, U-shaped steel framework supporting the dashboard's center area, and the brace at the glove box's bottom. Access the heater unit by removing the center-dash support and the plastic heater duct outlet panel. The blower housing and Evaporator housing remain, but for ease, loosen the blower/evaporator housing mounting screws. From the instrument panel's center opening, remove the heater unit mounting screw, followed by two lower screws. Slide the heater unit out, noting that the accelerator pedal may need removal and protecting the carpet from potential coolant spills. After removal, take out the foam insulator, sheet-metal shield, plastic brace, and then the heater core. Installation is the opposite of removal. Ensure the original foam sealing material is positioned correctly when reinstalling the heater core. After everything, refill the cooling system, run the engine, and check for leaks. For the rear: Some models have an optional heater/air conditioning system behind the left-rear interior trim panel, incorporating a blower, heater core, and evaporator core. Begin by removing the left rear trim panel, then discharge and recover the air conditioning refrigerant. Raise the vehicle for better access to hose connections underneath. Disconnect refrigerant lines and coolant hoses using a spring-lock coupling tool. Detach the upper duct from the auxiliary heater/air conditioning unit, all electrical connectors including those at the Blower Motor, resistor, and actuators. Remove the unit, followed by the screws and both actuator doors. Proceed by removing the heater core/evaporator core cover to access and then remove the cores. Installation is the reverse of removal. After setting up, refill the cooling system, recharge the refrigerant, and test the system for effective heating and cooling.