How to Maintain and Fix a Heater Core and What Steps Are Involved for a Mercury Cougar?

Repair and service of the heater core begins with disconnecting the battery ground cable followed by draining the cooling system. After suspending the vehicle position the heater hoses and engine vacuum line apart from the heater core before blowing out the heater core. Remove the floor console after lowering down the vehicle. Detach the air bag diagnostic monitor from its position then connect it to one side before disconnecting the vacuum supply line from the vacuum reservoir tank. To remove the heater outlet floor duct the first step involves disconnecting the air distributor from the heater/evaporator core housing while you remove the screw and slide the air duct upwards before releasing the retaining tabs on each side. You should start by disconnecting the De-ice sensor electrical connector before proceeding to unclip the four retaining clips of the heater core cover and core. Remove the De-ice sensor by unclipping its cable connection. Installation requires the same reverse order of removal steps followed by cooling system refill then testing the heat and air conditioning system for proper performance.

How to service the heater core on Mercury Grand Marquis?

An initial leak assessment through testing should happen prior to heater core removal for servicing purposes. You must start by uninstalling the plenum chamber then take out the screws which hold the heater core cover in place. The next step requires careful cutting of the seal which surrounds heater core inlet and outlet tubes before heater core extraction. Execute the installation by following the reverse steps of removal.

How to Properly Maintain and Replace the Heater Core in a Mercury Mariner?

Service of the heater core requires engine coolant drainage as the first step. Begin the heater core service by detaching both heater hoses from the heater core while releasing the clamps. First remove the instrument panel from the vehicle before disconnecting the temperature blend door lever and its screw. After screw removal of the heater core cover you should proceed to take out the three screws and the heater core cover to complete the heater core removal. Install the temperature blend door actuator and switch in their proper positions then use plain water to lubricate coolant hoses as needed before attaching the temperature blend door lever. The installation requires following the opposite steps of removal and filling and bleeding the engine cooling system. A heater core leak test should be performed before removing the component.

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
$70.89 MSRP: $112.56
You Save: $41.67 (38%)
Ships in 1-3 Business Days
ADD TO CART
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
ADD TO CART
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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1-20 of 28 Results

Mercury Heater Core Parts Questions & Experts Answers

Heater Core
YS2Z-18476-AA
Q: How to Maintain and Fix a Heater Core and What Steps Are Involved for a Mercury Cougar?
A: Repair and service of the heater core begins with disconnecting the battery ground cable followed by draining the cooling system. After suspending the vehicle position the heater hoses and engine vacuum line apart from the heater core before blowing out the heater core. Remove the floor console after lowering down the vehicle. Detach the air bag diagnostic monitor from its position then connect it to one side before disconnecting the vacuum supply line from the vacuum reservoir tank. To remove the heater outlet floor duct the first step involves disconnecting the air distributor from the heater/evaporator core housing while you remove the screw and slide the air duct upwards before releasing the retaining tabs on each side. You should start by disconnecting the De-ice sensor electrical connector before proceeding to unclip the four retaining clips of the heater core cover and core. Remove the De-ice sensor by unclipping its cable connection. Installation requires the same reverse order of removal steps followed by cooling system refill then testing the heat and air conditioning system for proper performance.
Heater Core
H2MZ-18476-J
Q: How to service the heater core on Mercury Grand Marquis?
A: An initial leak assessment through testing should happen prior to heater core removal for servicing purposes. You must start by uninstalling the plenum chamber then take out the screws which hold the heater core cover in place. The next step requires careful cutting of the seal which surrounds heater core inlet and outlet tubes before heater core extraction. Execute the installation by following the reverse steps of removal.
Heater Assembly
6L8Z-18478-AA
Q: How to Properly Maintain and Replace the Heater Core in a Mercury Mariner?
A: Service of the heater core requires engine coolant drainage as the first step. Begin the heater core service by detaching both heater hoses from the heater core while releasing the clamps. First remove the instrument panel from the vehicle before disconnecting the temperature blend door lever and its screw. After screw removal of the heater core cover you should proceed to take out the three screws and the heater core cover to complete the heater core removal. Install the temperature blend door actuator and switch in their proper positions then use plain water to lubricate coolant hoses as needed before attaching the temperature blend door lever. The installation requires following the opposite steps of removal and filling and bleeding the engine cooling system. A heater core leak test should be performed before removing the component.