Genuine Mazda Protege Heater Core

Mazda Protege Heater Core Parts and Q&A

• Core
  B25D-61-A10
  Q: How should one properly remove and replace the heater core on Mazda Protege?

  A:

  If equipped with air conditioning, have the refrigerant discharged and recovered by a qualified repair facility. Disconnect the cable from the negative battery terminal. Drain the engine coolant. Remove the instrument panel. For models without air conditioning, remove the seal plate on the right side of the heater unit by unlatching the seal plate latch. Disconnect the heater hoses from the heater core by unlocking the hose connections at the firewall, keeping plenty of towels or rags on the carpeting to catch any coolant that may drip. Remove the three nuts from the studs retaining the heater unit to the dash and then remove the heater unit from the dash, which will include the seal plate as an assembly. Remove the heater core from the heater unit, and reassembly is the reverse of removal, ensuring that the hose connectors are securely locked when installing the heater hoses on the heater core. For models with air conditioning, remove the evaporator unit, disconnect the heater hoses from the heater core by unlocking the hose connections at the firewall while keeping towels or rags on the carpeting to catch any coolant that may drip inside, disconnect the heater electrical connectors, remove the three nuts from the studs retaining the heater unit to the dash, and then remove the heater unit from the dash. Finally, remove the heater core from the heater unit, and reassembly is the reverse of removal, checking that the hose connectors are securely locked when installing the heater hoses on the heater unit.