Genuine 1990 Mazda 323 Heater Core

1990 Mazda 323 Heater Core Parts and Q&A

• Q: How should one properly remove and replace the heater core on 1990 Mazda 323?

  A: Provided it has air conditioning, service a qualified facility to recover the refrigerant. Loosen the negative battery and empty the engine coolant. Take out the seal plate and instrument panel on the heater unit. This requires disconnection of heater hoses, the heater unit and then the heater core. The reverse is called reassembly, which provides hose connections.