How to Remove and Replace the Heater Core in the HVAC System on 2006 Mazda 6?

This is a difficult procedure. Have A/C discharged. Disconnect battery, drain cooling system, disconnect heater hoses, expansion valve and refrigerant pipes, remove panel and HVAC unit, pull heater core and pipes, reinstall in reverse, reconnect hoses, replace gasket, refill and test.

Genuine 2006 Mazda 6 Heater Core

HVAC Heater Core

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2 Heater Cores found

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2006 Mazda 6 Heater Core Part Number: GK3J-61-A10
Product Specifications
- Other Name: Core, Heater Unit
- Item Weight: 3.00 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: GK3J-61-A10
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 2006 Mazda 6 Submodels:
- i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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2006 Mazda 6 Heater Core Part Number: GP9A61A10
Product Specifications
- Other Name: Core, Heater Unit
- Item Weight: 2.50 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: GP9A61A10
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following 2006 Mazda 6 Submodels:
- i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS

2006 Mazda 6 Heater Core Parts and Q&A

Q: How to Remove and Replace the Heater Core in the HVAC System on 2006 Mazda 6?
A: This is a difficult procedure. Have A/C discharged. Disconnect battery, drain cooling system, disconnect heater hoses, expansion valve and refrigerant pipes, remove panel and HVAC unit, pull heater core and pipes, reinstall in reverse, reconnect hoses, replace gasket, refill and test.