How should one properly remove and replace the heater core on 2003 Mazda Protege?

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.

Genuine 2003 Mazda Protege Heater Core

HVAC Heater Core

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2003 Mazda Protege Core Part Number: BJ0E-61-A10
$43.87 MSRP: $57.58
You Save: $13.71 (24%)
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Product Specifications
- Other Name: Core, Heater Unit; Core
- Item Weight: 3.10 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: BJ0E-61-A10
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 2003 Mazda Protege Submodels:
- DX, ES, LX, Mazdaspeed, MP3 | 4 Cyl 1.6 L GAS, 4 Cyl 2.0 L GAS

2003 Mazda Protege Heater Core Parts and Q&A

Q: How should one properly remove and replace the heater core on 2003 Mazda Protege?
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.