How to Service and Repair the Heater Core on Buick LaCrosse?

One must drain the coolant as the first step of heater core replacement. The Hose Clamp Pliers (J 38185) should be used to set aside clamps of the heater hose inlet and outlet before disconnecting the hookup between the heater core and hoses. The first step involves removing RH and LH instrument panel closeout/insulator panels together with floor carpet and communication interface module. Use Hose Clamp Pliers (J 38185) to transition the floor air outlet duct away from the floor reinforcement holes before cutting it free from the heater core outlet cover. To proceed you should remove the heater core outlet cover screws with heat stakes using a small chisel before taking off the outlet cover from the HVAC module assembly. First prepare the heater core cover by removing screws and heat stakes with a small chisel then take off the cover from the HVAC module assembly. Move the heater core as well as its foam seal outside the HVAC module assembly. The installation process requires addition of a new heater core foam seal to the HVAC module assembly before heater core installation. Install the heater core cover by drilling the dimples around its heat stakes using a 5.5 mm (7/32 in) drill bit and then tighten its screws to 1.5 N.m (13 lb in). Reuse the procedure to install the heater core outlet cover screws by tightening them to 1.5 N.m torque (13 lb in.). The rear air duct should be reattached from the heater core outlet to the floor reinforcement holes where it will be installed. The technician reattaches the communication interface module followed by the floor carpet and insulator panels for both sides of the instrument panel. You should link heater core inlet and outlet hoses and tighten their clamps with Hose Clamp Pliers (J 38185) before performing coolant refill.

How to Address Issues with the Heater Core on Buick Regal?

The first step to replace a Heater Core involves taking off the fuel injector sight shield along with draining coolant from the system. You need to detach both heater hoses from the Heater Core while also removing the lower floor console when present and then walking down the lh and rh instrument panel insulators. The outlet cover must be moved downward and to the rear from the duct assembly before you can remove its screws and the outlet assembly. You will now detach the Heater Core cover by unfastening its screws while removing the cover along with seats (1, 2, 3) and Heater Core outer seal. First remove the Heater Core line clamp screw followed by its retaining clamp before moving on to the Heater Core pipe retainer clamp screw . Remove the Heater Core from its position inside the hvac lower case after discarding all seals consisting of the lower seal and center seal and upper seal and side seals. Insert the new side seals and upper seal along with the center seal and lower seal onto the hvac case before inserting the Heater Core. The installation requires a screw to fasten the Heater Core line clamp at 1.5 n.m (13 lb in) while the Heater Core mounting clip requires another screw with a proper 1.5 n.m (13 lb in) torque setting. Position the Heater Core outer seal to the Heater Core and afterward install new seals (1, 2, 3) onto the Heater Core cover. Secure the cover with its screws to 1.5 n.m (13 lb in) torque specification. Place both Heater Core outlet cover screws and tighten them to 1.5 n.m (13 lb in). Completing the service requires lower floor console installation if present together with lh and rh instrument panel insulators reinstallation followed by connecting the heater hoses to the Heater Core before refilling the coolant system and installing the fuel injector sight shield.

OEM Buick Heater Core

HVAC Heater Core

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46 Heater Cores found

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Buick Heater Core Part Number: 84406079
$84.82 MSRP: $178.66
You Save: $93.84 (53%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Kit-Heater; HVAC Heater Core; Core, Heater Core
- Replaces: 15232212
Fits the following Buick Models:
- Enclave | 2008-2024 | Avenir, Base, CX, CXL, Convenience, Essence, Leather, Preferred, Premium | 6 Cyl 3.6 L GAS
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Buick Heater Core Part Number: 22961456
$91.89 MSRP: $272.02
You Save: $180.13 (67%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Assembly-Heater; Core, Heater Core
- Replaces: 20829256, 22782131, 25786439, 20843382
Fits the following Buick Models:
- Enclave | 2008-2017 | Base, CX, CXL, Convenience, Leather, Premium | 6 Cyl 3.6 L GAS
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Buick Core Kit, Heater Core Part Number: 84760093
$81.25 MSRP: $194.81
You Save: $113.56 (59%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Core Kit-Heater
- Replaces: 84206592
Fits the following Buick Models:
- Cascada | 2019 | Base, Premium, Sport Touring | 4 Cyl 1.6 L GAS
- Enclave | 2018-2024 | Avenir, Base, Essence, Preferred, Premium | 6 Cyl 3.6 L GAS
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Buick Heater Core Part Number: 84206592
$81.25 MSRP: $194.81
You Save: $113.56 (59%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Kit-Heater; Evaporator Core
- Replaced by: 84760093
Fits the following Buick Models:
- Cascada | 2019 | Base, Premium, Sport Touring | 4 Cyl 1.6 L GAS
- Enclave | 2018-2024 | Avenir, Base, Essence, Preferred, Premium | 6 Cyl 3.6 L GAS
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Buick Heater Core Part Number: 23176934
$79.31 MSRP: $167.06
You Save: $87.75 (53%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Kit-Heater; Core Kit, Heater Core
Fits the following Buick Models:
- Envision | 2016-2020 | Base, Essence, Preferred, Premium, Premium II | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L FLEX, 4 Cyl 2.5 L GAS
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Buick Heater Core Part Number: 84215014
$79.89 MSRP: $168.25
You Save: $88.36 (53%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Assembly-Heater; Core, Heater Core
- Replaces: 23506093
Fits the following Buick Models:
- Envision | 2021-2025 | Avenir, Essence, Preferred, Sport Touring | 4 Cyl 2.0 L GAS
- LaCrosse | 2017-2019 | Avenir, Base, Essence, Preferred, Premium, Sport Touring | 4 Cyl 2.5 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.6 L GAS
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Buick Heater Core Part Number: 13287939
$78.71 MSRP: $161.72
You Save: $83.01 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Kit-Heater; Evaporator Core; Core Kit, Heater Core
Fits the following Buick Models:
- Cascada | 2016-2018 | Base, Premium, Sport Touring | 4 Cyl 1.6 L GAS
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Buick Heater Core Part Number: 13406298
$83.00 MSRP: $170.56
You Save: $87.56 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Kit, Heater Core
- Replaces: 20782084, 13263329
Fits the following Buick Models:
- LaCrosse | 2010-2016 | Base, CX, CXL, CXS, Convenience, Leather, Premium, Sport Touring, Touring | 4 Cyl 2.4 L GAS, 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.0 L GAS, 6 Cyl 3.6 L FLEX, 6 Cyl 3.6 L GAS
- Regal | 2011-2017 | Base, CXL, GS, Premium, Sport Touring | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS, 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV)
- Verano | 2012-2017 | Base, Convenience, Leather, Premium, Sport Touring, Turbo | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS
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Buick Heater Core Part Number: 42615975
$141.42 MSRP: $290.62
You Save: $149.20 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Kit-Heater; Core Kit, Heater Core
- Replaces: 95018021
Fits the following Buick Models:
- Encore | 2013-2022 | Base, Convenience, Essence, Leather, Preferred, Preferred II, Premium, Sport Touring | 4 Cyl 1.4 L GAS
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Buick Heater Core Part Number: 3042073
$48.39 MSRP: $90.88
You Save: $42.49 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core-Heater
- Replaced by: 52479875
Fits the following Buick Models:
- Century | 1984-1992 | Custom, Estate Wagon, Limited, Special, T-Type | 4 Cyl 2.5 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.3 L GAS, 6 Cyl 3.8 L GAS, 6 Cyl 4.3 L DIESEL
- Skylark | 1984-1985 | Custom, Limited, T-Type | 4 Cyl 2.5 L GAS, 6 Cyl 2.8 L GAS
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Buick Heater Core Part Number: 84689022
$48.82 MSRP: $91.68
You Save: $42.86 (47%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Core Assembly-Auxiliary Heater; Core, Heater Core
Fits the following Buick Models:
- Enclave | 2025 | Avenir, Preferred, Sport Touring | 4 Cyl 2.5 L GAS
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Buick Heater Core Part Number: 39158689
$67.76 MSRP: $127.24
You Save: $59.48 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Kit-Heater; Core Kit, Heater Core
- Replaces: 39141057
Fits the following Buick Models:
- Regal Sportback | 2018-2020 | Avenir, Base, Essence, GS, Preferred, Preferred II | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- Regal TourX | 2018-2020 | Base, Essence, Preferred | 4 Cyl 2.0 L GAS
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Buick Heater Core Part Number: 42812124
$68.28 MSRP: $128.21
You Save: $59.93 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Core Assembly-Heater; Core, Heater Core
Fits the following Buick Models:
- Envista | 2024-2025 | Avenir, Preferred, Sport Touring | 3 Cyl 1.2 L FLEX, 3 Cyl 1.2 L GAS
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Buick Heater Core Part Number: 89018289
$157.16 MSRP: $295.14
You Save: $137.98 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Core, Heater; Core, Heater Core
Fits the following Buick Models:
- LaCrosse | 2005-2009 | CX, CXL, CXS, Super | 6 Cyl 3.6 L GAS, 6 Cyl 3.8 L GAS, 8 Cyl 5.3 L GAS
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Buick Core Kit, Heater Core Part Number: 26526766
$28.99 MSRP: $54.44
You Save: $25.45 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Core Kit-Heater
Fits the following Buick Models:
- Enclave | 2025 | Avenir, Preferred, Sport Touring | 4 Cyl 2.5 L GAS
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Buick Heater Core Part Number: 42677734
$58.16 MSRP: $105.26
You Save: $47.10 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Core Assembly-Heater; Core, Heater Core
Fits the following Buick Models:
- Encore GX | 2020-2025 | Avenir, Essence, Preferred, Select, Sport Touring | 3 Cyl 1.2 L FLEX, 3 Cyl 1.2 L GAS, 3 Cyl 1.3 L GAS
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Buick Heater Core Part Number: 52498633
Product Specifications
- Other Name: Core, Heater; HVAC Heater Core; Core, Heater Core
Fits the following Buick Models:
- Rainier | 2004-2007 | CXL, CXL Plus | 6 Cyl 4.2 L GAS, 8 Cyl 5.3 L GAS
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Buick Heater Core Part Number: 22784517
Product Specifications
- Other Name: Core Assembly-Heater; HVAC Heater Core; Core; Core, Heater Core
- Replaces: 52462735, 52470154, 89019251
Fits the following Buick Models:
- Electra | 1986-1990 | Limited, Park Avenue, Park Avenue Ultra, T-Type | 6 Cyl 3.8 L GAS
- LeSabre | 1986-1999 | Base, Custom, Limited, T-Type | 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Park Avenue | 1991-1996 | Base, Ultra | 6 Cyl 3.8 L GAS
- Reatta | 1988-1991 | Base | 6 Cyl 3.8 L GAS
- Riviera | 1986-1993 | Luxury, T-Type | 6 Cyl 3.8 L GAS
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Buick Heater Core Part Number: 88956887
Product Specifications
- Other Name: Core, Heater Core; HVAC Heater Core
- Replaces: 52481498, 52465600
Fits the following Buick Models:
- Century | 1997-2005 | Custom, Limited, Special Edition | 6 Cyl 3.1 L GAS
- Regal | 1997-2004 | 25th Anniversary Edition, GS, GSE, LS, LSE | 6 Cyl 3.8 L GAS
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Buick Heater Core Part Number: 52482185
Product Specifications
- Other Name: Core, Heater; HVAC Heater Core; Core, Heater Core
Fits the following Buick Models:
- LeSabre | 2000-2005 | Custom, Limited | 6 Cyl 3.8 L GAS

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1-20 of 46 Results

Buick Heater Core

Choose OEM Heater Core, you're making the optimal decision for superior quality and perfect performance. You can feel confident because each component goes through stringent quality checks. Every part is carefully built to comply with Buick's factory specifications. You'll enjoy a smooth, worry-free installation that fits just right. At ChevyPartsDeal.com, you'll find it easy to get top-quality OEM Buick Heater Core. You can shop at highly competitive prices and protect your budget. All our genuine Buick parts include a dependable manufacturer's warranty. You'll also appreciate our straightforward return policy and swift delivery services for extra convenience.

Buick Heater Core is pulling engine warmth to make cabins warm at the time of rain, snow, or cold dawn drives. Buick has long pursued ride comfort instead of bragging rights, flattening out potholes with soft bushings, drowning out the road with QuietTuning glass, and providing drivers with uncomplicated dashboards that do not include any gimmicks but make smartphones delighted with smooth infotainment features that they can master in a few minutes. The name appears in driveways where families desire elegant styling that is neither flashy yet still gives an allusion to the sculpted Wildcat EV future. Buick walks the line between tradition and innovation, allowing retirees and first-time purchasers to slide into padded cabins that reduce noise the traffic and have turbo engines provide a quiet push without having to waste a fortune at the gas pump. The curves in the present-day swooping lines are just sketches of the concepts of the 1950s and hence the profile is immediately recognizable in every boulevard. The Heater Core, an interior part, is a small radiator made of aluminum, where hot coolant coming back off the engine is stolen, replaced by that heat by air being forced into the cabin by the fan, and simple blend doors are operated by the touch of a single dial. Having the refrigerant cool air in summer, the moist air passes the Heater Core three times, drying the moisture, which keeps the windows clear. Blockages, rust, or leaked antifreeze are warning signals that it is time to act before you have to enjoy the stink of a swamp every morning on the way to work.

Buick Heater Core Parts and Q&A

Heater Core
89018289
Q: How to Service and Repair the Heater Core on Buick LaCrosse?
A:
One must drain the coolant as the first step of heater core replacement. The Hose Clamp Pliers (J 38185) should be used to set aside clamps of the heater hose inlet and outlet before disconnecting the hookup between the heater core and hoses. The first step involves removing RH and LH instrument panel closeout/insulator panels together with floor carpet and communication interface module. Use Hose Clamp Pliers (J 38185) to transition the floor air outlet duct away from the floor reinforcement holes before cutting it free from the heater core outlet cover. To proceed you should remove the heater core outlet cover screws with heat stakes using a small chisel before taking off the outlet cover from the HVAC module assembly. First prepare the heater core cover by removing screws and heat stakes with a small chisel then take off the cover from the HVAC module assembly. Move the heater core as well as its foam seal outside the HVAC module assembly. The installation process requires addition of a new heater core foam seal to the HVAC module assembly before heater core installation. Install the heater core cover by drilling the dimples around its heat stakes using a 5.5 mm (7/32 in) drill bit and then tighten its screws to 1.5 N.m (13 lb in). Reuse the procedure to install the heater core outlet cover screws by tightening them to 1.5 N.m torque (13 lb in.). The rear air duct should be reattached from the heater core outlet to the floor reinforcement holes where it will be installed. The technician reattaches the communication interface module followed by the floor carpet and insulator panels for both sides of the instrument panel. You should link heater core inlet and outlet hoses and tighten their clamps with Hose Clamp Pliers (J 38185) before performing coolant refill.
Heater Core
88956887
Q: How to Address Issues with the Heater Core on Buick Regal?
A:
The first step to replace a Heater Core involves taking off the fuel injector sight shield along with draining coolant from the system. You need to detach both heater hoses from the Heater Core while also removing the lower floor console when present and then walking down the lh and rh instrument panel insulators. The outlet cover must be moved downward and to the rear from the duct assembly before you can remove its screws and the outlet assembly. You will now detach the Heater Core cover by unfastening its screws while removing the cover along with seats (1, 2, 3) and Heater Core outer seal. First remove the Heater Core line clamp screw followed by its retaining clamp before moving on to the Heater Core pipe retainer clamp screw . Remove the Heater Core from its position inside the hvac lower case after discarding all seals consisting of the lower seal and center seal and upper seal and side seals. Insert the new side seals and upper seal along with the center seal and lower seal onto the hvac case before inserting the Heater Core. The installation requires a screw to fasten the Heater Core line clamp at 1.5 n.m (13 lb in) while the Heater Core mounting clip requires another screw with a proper 1.5 n.m (13 lb in) torque setting. Position the Heater Core outer seal to the Heater Core and afterward install new seals (1, 2, 3) onto the Heater Core cover. Secure the cover with its screws to 1.5 n.m (13 lb in) torque specification. Place both Heater Core outlet cover screws and tighten them to 1.5 n.m (13 lb in). Completing the service requires lower floor console installation if present together with lh and rh instrument panel insulators reinstallation followed by connecting the heater hoses to the Heater Core before refilling the coolant system and installing the fuel injector sight shield.