How to service the heater core on Mercury Mariner?

The first step for servicing the heater core requires the drain of engine coolant followed by clamp release to free two heater hoses from the heater core. The heater core service starts by removing the instrument panel followed by removing the screw and the temperature blend door lever. The procedure requires removal of the heater core from the housing by first unscrewing three screws fixing the cover. Place the temperature blend door lever along with its actuator and switch into proper alignment during reinstallation. The coolant hoses need plain water for lubrication only when required. The installation completion requires proceeding through the removal steps backward and performing proper filling and bleeding of the engine cooling system. A heater core leak test should happen before removing the unit.

How to service the heater core on Mercury Cougar?

The service of the heater core begins by disconnecting the ground cable of the battery and draining the cooling system. The service process requires raising the vehicle and separating the heater hoses from the heater core as well as the vacuum line from the engine before performing a heater core blowout. The platform should be lowered before taking out the floor console. Place the air bag diagnostic monitor aside before disconnecting the vacuum supply line which leads to the vacuum reservoir tank. The air distributor and heater outlet floor duct require removal by first disconnecting the distributor from the heater/evaporator core housing then removing the duct by removing its screw before sliding it upwards and releasing the retaining tabs on each side. To perform the heater core removal disconnect the De-ice sensor electrical connector before removing the heater core cover along with the core itself by releasing all four retaining clips. Disconnect the De-ice sensor by extracting its cable then removing its clip. Reverse the removal procedure to install the heater core and refill the cooling system then verify the normal operation of the heating and air conditioning system.

OEM Mercury Heater Core

HVAC Heater Core

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28 Heater Cores found

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Mercury 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
Fits the following Mercury Models:
- Mariner | 2005-2007 | 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 Heater Core Part Number: H2MZ-18476-AC
$77.29 MSRP: $122.73
You Save: $45.44 (38%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core; Core
- Replaces: F5TZ-18476-A, HC-14
Fits the following Mercury Models:
- Mountaineer | 1997-2001 | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS
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Mercury Heater Core, Front Part Number: H2MZ-18476-S
$83.63 MSRP: $115.69
You Save: $32.06 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core, Front; HVAC Heater Core
- Position: Front
- Replaces: 4F2Z-18476-AA, HC-38
Fits the following Mercury Models:
- Monterey | 2004-2007 | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS
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Mercury Heater Core Part Number: XF5Z-18476-AA
$72.79 MSRP: $100.70
You Save: $27.91 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core; Core Assembly - Heater
- Manufacturer Note: Main Unit
Fits the following Mercury Models:
- Villager | 1999-2002 | Base, Estate, Sport | 6 Cyl 3.3 L GAS
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Mercury Heater Core Part Number: F3XY-18476-B
$111.04 MSRP: $153.61
You Save: $42.57 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Assembly - Heater
- Manufacturer Note: Main Unit
Fits the following Mercury Models:
- Villager | 1993-1998 | GS, LS, Nautica | 6 Cyl 3.0 L GAS
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Mercury Heater Core Part Number: YS2Z-18476-AA
$151.78 MSRP: $206.54
You Save: $54.76 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Heater Assembly - Less Radiator
- Manufacturer Note: Core
Fits the following Mercury Models:
- Cougar | 1999-2002 | Base, S, V6 | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
- Mystique | 1996-2000 | GS, LS | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
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Mercury Heater Core Part Number: E9LY-18476-A
Product Specifications
- Other Name: Core Assembly - Heater; HVAC Heater Core; Core
Fits the following Mercury Models:
- Capri | 1984-1986 | 5.0, GS, RS, RS Turbo | 4 Cyl 2.3 L GAS, 6 Cyl 3.8 L GAS, 8 Cyl 5.0 L GAS
- Cougar | 1984-1988 | Base, LS, XR-7 | 4 Cyl 2.3 L GAS, 6 Cyl 3.8 L GAS, 8 Cyl 5.0 L GAS
- Marquis | 1984-1986 | Base, Brougham | 4 Cyl 2.3 L GAS, 4 Cyl 2.3 L LPG, 6 Cyl 3.8 L GAS
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Mercury Heater Core Part Number: H2MZ-18476-Z
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core
- Replaces: 8L8Z-18476-A, HC-50
Fits the following Mercury Models:
- Mariner | 2008-2011 | 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 Heater Assembly Part Number: 9L5Z-18471-B
Product Specifications
- Other Name: Duct - Air Vent; HVAC Heater Core Case Assembly; Heater Core Case; HVAC Unit Case; Heater Core; Housing Assembly; Case Assembly; Heater Case
- Replaces: 7L5Z-18471-A, 8L5Z-18471-A, 9L5Z-18471-A
Fits the following Mercury Models:
- Mountaineer | 1997-2001 | Base | 6 Cyl 4.0 L GAS, 8 Cyl 5.0 L GAS
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Mercury Heater Core, Front Part Number: AA5Z-18476-B
Product Specifications
- Other Name: Radiator And Seal Assembly - Heater; HVAC Heater Core, Front; HVAC Heater Core
- Manufacturer Note: Includes Seal
- Position: Front
- Replaces: HC-53, AA5Z-18476-A, 8G1Z-18476-A
Fits the following Mercury Models:
- Sable | 2008-2009 | Base, Premier | 6 Cyl 3.5 L GAS
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Mercury Heater Core Part Number: H2MZ-18476-H
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core
- Replaces: HC-20, F8VZ-18476-AA
Fits the following Mercury Models:
- Grand Marquis | 1998-2000 | GS, LS | 8 Cyl 4.6 L GAS
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Mercury Heater Core Part Number: F3XY18476A
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core
Fits the following Mercury Models:
- Villager | 1993-1998 | GS, LS, Nautica | 6 Cyl 3.0 L GAS
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Mercury Heater Core Part Number: H2MZ-18476-J
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core; Core
- Replaces: HC-31
Fits the following Mercury Models:
- Colony Park | 1990-1991 | GS, LS | 8 Cyl 5.0 L GAS
- Grand Marquis | 1990-2011 | GS, GSL, Limited Edition, LS, LSE, Ultimate Edition | 8 Cyl 4.6 L FLEX, 8 Cyl 4.6 L GAS, 8 Cyl 5.0 L GAS
- Marauder | 2003-2004 | Base | 8 Cyl 4.6 L GAS
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Mercury Heater Core Part Number: H2MZ-18476-T
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core
- Replaces: HC-39, 5F9Z-18476-DA
Fits the following Mercury Models:
- Montego | 2005-2007 | Luxury, Premier | 6 Cyl 3.0 L GAS
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Mercury Heater Assembly Part Number: XF5Z-18478-BA
Product Specifications
- Other Name: Heater Core
- Manufacturer Note: MANUAL
Fits the following Mercury Models:
- Villager | 1999-2002 | Base, Estate, Sport | 6 Cyl 3.3 L GAS
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Mercury Heater Core Part Number: H2MZ-18476-A
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core
- Replaces: F5OY-18476-A, HC-19, F8OZ-18476-AA
Fits the following Mercury Models:
- Sable | 1996-2005 | G, GS, LS, LS Premium, Platinum Edition | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mercury Heater Core, Front Part Number: H2MZ-18476-Y
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core, Front; HVAC Heater Core
- Position: Front
- Replaces: 7L2Z-18476-A, HC-41, 5L2Z-18476-AA, 6L2Z-18476-A, HC-47
Fits the following Mercury Models:
- Mountaineer | 2002-2010 | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS
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Mercury Heater Core, Rear Part Number: H2MZ-18476-X
Product Specifications
- Other Name: Heater Assembly - Less Radiator; HVAC Heater Core, Rear; HVAC Heater Core
- Position: Rear
- Replaces: 1L2Z-18476-CA, HC-32, HC-25, F85Z-18476-AA, HC-22
Fits the following Mercury Models:
- Monterey | 2004-2007 | Base, Convenience, Luxury, Premier | 6 Cyl 4.2 L GAS
- Mountaineer | 2002-2010 | Base, Convenience, Luxury, Premier | 6 Cyl 4.0 L FLEX, 6 Cyl 4.0 L GAS, 8 Cyl 4.6 L GAS
View related parts
Mercury Heater Core Part Number: AE5Z-18476-BA
Product Specifications
- Other Name: Core Assembly - Heater; HVAC Heater Core
- Replaces: 6E5Z-18476-AA, 6E5Z-18476-BA, HC-61
Fits the following Mercury Models:
- Milan | 2006-2011 | Base, Hybrid, Premier | 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
View related parts
Mercury Heater Assembly Part Number: 6L8Z-18478-AA
Product Specifications
- Other Name: HVAC Unit Case Assembly; Heater Core
- Replaces: 5L8Z-18478-A
Fits the following Mercury Models:
- Mariner | 2005-2007 | 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 Heater Core

OEM Heater Core boasts unmatched quality. Each part goes through full quality checks. They adhere to Mercury's official factory standards. These steps remove flaws and inconsistencies. So you can get Heater Core with long life and a perfect fit. Come to our website and find genuine Mercury parts. We keep a wide inventory of OEM parts at the highly affordable prices. It's easy to search, compare, and pick what you need. You'll love the clear info and simple checkout. We offer top-rated customer service, and we reply fast. We also ship promptly to ensure your order arrives on time.

Mercury Heater Core Parts and Q&A

Heater Assembly
6L8Z-18478-AA
Q: How to service the heater core on Mercury Mariner?
A:
The first step for servicing the heater core requires the drain of engine coolant followed by clamp release to free two heater hoses from the heater core. The heater core service starts by removing the instrument panel followed by removing the screw and the temperature blend door lever. The procedure requires removal of the heater core from the housing by first unscrewing three screws fixing the cover. Place the temperature blend door lever along with its actuator and switch into proper alignment during reinstallation. The coolant hoses need plain water for lubrication only when required. The installation completion requires proceeding through the removal steps backward and performing proper filling and bleeding of the engine cooling system. A heater core leak test should happen before removing the unit.
Heater Core
YS2Z-18476-AA
Q: How to service the heater core on Mercury Cougar?
A:
The service of the heater core begins by disconnecting the ground cable of the battery and draining the cooling system. The service process requires raising the vehicle and separating the heater hoses from the heater core as well as the vacuum line from the engine before performing a heater core blowout. The platform should be lowered before taking out the floor console. Place the air bag diagnostic monitor aside before disconnecting the vacuum supply line which leads to the vacuum reservoir tank. The air distributor and heater outlet floor duct require removal by first disconnecting the distributor from the heater/evaporator core housing then removing the duct by removing its screw before sliding it upwards and releasing the retaining tabs on each side. To perform the heater core removal disconnect the De-ice sensor electrical connector before removing the heater core cover along with the core itself by releasing all four retaining clips. Disconnect the De-ice sensor by extracting its cable then removing its clip. Reverse the removal procedure to install the heater core and refill the cooling system then verify the normal operation of the heating and air conditioning system.