How to service the heater core on Mercury Mariner?

To maintain the heater core drain the coolant, disconnect heater hoses, and to remove instrument panel. Removal of temperature blend door lever, heater core cover screws and removal of heater core occur. Installation is to be done in reverse order with correct positioning of parts and leak test may be done as necessary.

How should a heater core leak be tested and How to its remove and install on Mercury Mariner?

A suspected heater core leak may be tested by first removing the heater core and evaporator core housing then the dash panel seal. Unscrew the screw holding the heater core bracket and bracket, and screw the screw back in 3 Nm (27 lb-in) on reinstallation. Lastly, and finally, installation requires reversing the steps of removing.

OEM Mercury Mariner Heater Core

HVAC Heater Core

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3 Heater Cores found

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Mercury Mariner Heater Core Part Number: H2MZ-18476-M
$70.01 MSRP: $95.27
You Save: $25.26 (27%)
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Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core
- Replaces: YL8Z-18476-AA, HC-28
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Mercury Mariner | Base, Convenience, Hybrid, Luxury, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mercury Mariner Heater Core Part Number: H2MZ-18476-Z
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core
- Replaces: 8L8Z-18476-A, HC-50
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2008-2011 Mercury Mariner | Base, Hybrid, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Mariner Heater Assembly Part Number: 6L8Z-18478-AA
Product Specifications
- Other Name: HVAC Unit Case Assembly; Heater Core
- Replaces: 5L8Z-18478-A
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2005-2007 Mercury Mariner | Base, Convenience, Hybrid, Luxury, Premier | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS

Mercury Mariner Heater Core

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Mercury Mariner Heater Core Parts and Q&A

Heater Assembly
6L8Z-18478-AA
Q: How to service the heater core on Mercury Mariner?
A: To maintain the heater core drain the coolant, disconnect heater hoses, and to remove instrument panel. Removal of temperature blend door lever, heater core cover screws and removal of heater core occur. Installation is to be done in reverse order with correct positioning of parts and leak test may be done as necessary.
Heater Core
H2MZ-18476-Z
Q: How should a heater core leak be tested and How to its remove and install on Mercury Mariner?
A: A suspected heater core leak may be tested by first removing the heater core and evaporator core housing then the dash panel seal. Unscrew the screw holding the heater core bracket and bracket, and screw the screw back in 3 Nm (27 lb-in) on reinstallation. Lastly, and finally, installation requires reversing the steps of removing.