Genuine GM Heater Core

HVAC Heater Core

Enter your vehicle info to find more parts and verify fitment

  • Select Vehicle by VIN
  • Select Vehicle by Model
Select by VIN
Enter your VIN for the most accurate results.
Enter your VIN for the most accurate results.
or
Select by Model
-- Select Make --
-- Select Model --
-- Select Year --

We offer a full selection of genuine GM Heater Cores, engineered specifically to restore factory performance. Please narrow the HVAC Heater Core results by selecting the vehicle.

161 Heater Cores found

  • GM Heater Core - 89018297
    View related parts
    GM Core Asm,Heater
    Part Number: 89018297
    Other Name: CORE, Heater Core; Heater Core Replaces: 52473322, 52473326
    Your Price: $149.66
    Retail Price: $282.38
    You Save: $132.72
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Cadillac | Escalade | 2002-2014 | 8 Cyl 5.3L, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L, 8 Cyl 6.2L Flex
    • Chevrolet | Avalanche | 2002-2013 | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 8.1L
    • Chevrolet | Silverado | 1999-2014 | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L Flex, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L
    • Chevrolet | Suburban | 2000-2014 | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 8.1L
    • Chevrolet | Tahoe | 2000-2014 | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 5.7L, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
    • GMC | Sierra | 1999-2014 | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L, 8 Cyl 6.2L Flex, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L
    • GMC | Yukon | 2000-2014 | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 5.7L, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L, 8 Cyl 6.2L Flex, 8 Cyl 8.1L
    • Hummer | H2 | 2008-2009 | 8 Cyl 6.2L, 8 Cyl 6.2L Flex
    View More
    Less Info
  • GM Heater Core - 89019173
    View related parts
    GM Core,Heater
    Part Number: 89019173
    Other Name: CORE, Heater Core; Heater Core Replaces: 52467018
    Your Price: $86.56
    Retail Price: $181.86
    You Save: $95.30
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Cadillac | Escalade | 1999-2000 | 8 Cyl 5.7L
    • Chevrolet | Blazer | 1992-1994 | 6 Cyl 4.3L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel
    • Chevrolet | C1500 | 1988-1999 | 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L
    • Chevrolet | C2500 | 1988-2000 | 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L
    • Chevrolet | C3500 | 1988-2002 | 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L
    • Chevrolet | K1500 | 1988-1999 | 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel
    • Chevrolet | K2500 | 1988-2000 | 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L
    • Chevrolet | K3500 | 1988-2000 | 8 Cyl 5.7L, 8 Cyl 6.2L Diesel, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L
    • Chevrolet | Suburban | 1992-1999 | 8 Cyl 5.7L, 8 Cyl 6.5L Diesel, 8 Cyl 7.4L
    • Chevrolet | Tahoe | 1995-2000 | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.7L, 8 Cyl 6.5L Diesel
    View More
    Less Info
  • GM Heater Core - 52497763
    View related parts
    GM Core Asm,Heater
    Part Number: 52497763
    Other Name: CORE, Heater Core; Heater Core Replaces: 52468013
    Your Price: $166.05
    Retail Price: $313.30
    You Save: $147.25
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Express | 1996-2021 | 4 Cyl 2.8L Diesel, 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.0L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 5.7L, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.5L Diesel, 8 Cyl 6.6L Diesel, 8 Cyl 7.4L, 8 Cyl 8.1L
    • GMC | Savana | 1996-2021 | 4 Cyl 2.8L Diesel, 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.0L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 5.7L, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.5L Diesel, 8 Cyl 6.6L, 8 Cyl 6.6L Diesel, 8 Cyl 7.4L, 8 Cyl 8.1L
    Less Info
  • GM Heater Core - 84406079
    View related parts
    GM Core Kit, Htr
    Part Number: 84406079
    Other Name: Heater Core Replaces: 15232212
    Your Price: $65.30
    Retail Price: $123.20
    You Save: $57.90
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Buick | Enclave | 2008-2021 | 6 Cyl 3.6L
    • Cadillac | CT6 | 2016-2020 | 4 Cyl 2.0L, 6 Cyl 3.0L, 6 Cyl 3.6L, 8 Cyl 4.2L
    • Cadillac | Escalade | 2007-2020 | 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L, 8 Cyl 6.2L Flex
    • Cadillac | XT6 | 2020-2021 | 6 Cyl 3.6L
    • Chevrolet | Tahoe | 2007-2020 | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L
    • Chevrolet | Traverse | 2009-2021 | 4 Cyl 2.0L, 6 Cyl 3.6L
    • GMC | Acadia | 2007-2021 | 4 Cyl 2.0L, 4 Cyl 2.5L, 6 Cyl 3.6L
    • GMC | Yukon | 2007-2020 | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L, 8 Cyl 6.2L Flex
    • Saturn | Outlook | 2007-2010 | 6 Cyl 3.6L
    View More
    Less Info
  • GM Heater Core - 19258989
    View related parts
    GM Core Asm,Heater
    Part Number: 19258989
    Other Name: CORE, Heater Core; Heater Core Replaces: 88986627
    Your Price: $137.50
    Retail Price: $259.44
    You Save: $121.94
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Cadillac | Escalade | 2003-2005 | 8 Cyl 5.3L, 8 Cyl 6.0L
    • Chevrolet | Avalanche | 2003-2006 | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 8.1L
    • Chevrolet | Silverado | 2003-2007 | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L
    • Chevrolet | Suburban | 2003-2004 | 8 Cyl 6.0L, 8 Cyl 8.1L
    • GMC | Sierra | 2003-2007 | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.2L, 8 Cyl 6.6L Diesel, 8 Cyl 8.1L
    • Hummer | H2 | 2003-2007 | 8 Cyl 6.0L
    View More
    Less Info
  • GM Heater Core - 22784517
    View related parts
    GM Core Assembly, Heater
    Part Number: 22784517
    Other Name: CORE, Heater Core; Core, Heater Core Replaces: 89019251, 52470154, 52462735
    Your Price: $101.62
    Retail Price: $191.74
    You Save: $90.12
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Buick | Electra | 1985-1990 | 6 Cyl 3.0L, 6 Cyl 3.8L, 6 Cyl 4.3L Diesel, 8 Cyl 5.0L
    • Buick | Lesabre | 1987-1999 | 6 Cyl 3.8L
    • Buick | Park Avenue | 1991-1996 | 6 Cyl 3.8L
    • Buick | Reatta | 1988-1991 | 6 Cyl 3.8L
    • Buick | Riviera | 1986-1993 | 6 Cyl 3.8L
    • Cadillac | Allante | 1987-1993 | 8 Cyl 4.1L, 8 Cyl 4.5L, 8 Cyl 4.6L
    • Cadillac | Deville | 1985-1999 | 6 Cyl 4.3L Diesel, 8 Cyl 4.1L, 8 Cyl 4.5L, 8 Cyl 4.6L, 8 Cyl 4.9L
    • Cadillac | Eldorado | 1986-2002 | 8 Cyl 4.1L, 8 Cyl 4.5L, 8 Cyl 4.6L, 8 Cyl 4.9L
    • Cadillac | Fleetwood | 1985-1993 | 6 Cyl 4.3L Diesel, 8 Cyl 4.1L, 8 Cyl 4.5L, 8 Cyl 4.9L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 5.7L Diesel
    • Cadillac | Seville | 1986-1999 | 8 Cyl 4.1L, 8 Cyl 4.5L, 8 Cyl 4.6L, 8 Cyl 4.9L
    View More
    Less Info
  • GM Heater Core - 52473178
    View related parts
    GM Core,Heater
    Part Number: 52473178
    Other Name: CORE, Heater Core; Heater Core
    Your Price: $106.72
    Retail Price: $201.36
    You Save: $94.64
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Blazer | 1998-2005 | 6 Cyl 4.3L
    • Chevrolet | S10 | 1998-2004 | 4 Cyl 2.2L, 4 Cyl 2.2L Flex, 6 Cyl 4.3L
    • GMC | Jimmy | 1998-2001 | 6 Cyl 4.3L
    • GMC | Sonoma | 1998-2004 | 4 Cyl 2.2L, 4 Cyl 2.2L Flex, 6 Cyl 4.3L
    • Oldsmobile | Bravada | 1998-2001 | 6 Cyl 4.3L
    View More
    Less Info
  • GM Heater Core - 10328330
    View related parts
    GM Heater Asm
    Part Number: 10328330
    Other Name: HEATER, Heater
    Your Price: $92.89
    Retail Price: $175.26
    You Save: $82.37
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Venture | 2001-2005 | 6 Cyl 3.4L
    • Oldsmobile | Silhouette | 2001-2004 | 6 Cyl 3.4L
    • Pontiac | Montana | 2001-2005 | 6 Cyl 3.4L
    View More
    Less Info
  • GM Heater Core - 89022548
    View related parts
    GM Core Asm,Heater
    Part Number: 89022548
    Other Name: CORE, Heater Core; Heater Core
    Your Price: $62.73
    Retail Price: $118.36
    You Save: $55.63
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Cadillac | CTS | 2008-2015 | 6 Cyl 3.0L, 6 Cyl 3.6L, 8 Cyl 6.2L
    • Cadillac | STS | 2005-2011 | 6 Cyl 3.6L, 8 Cyl 4.4L, 8 Cyl 4.6L
    Less Info
  • GM Heater Core - 52469301
    View related parts
    GM Core,Auxiliary Heater
    Part Number: 52469301
    Other Name: CORE, Heater Core; Auxiliary Heater Core, Heater Core
    Your Price: $84.46
    Retail Price: $159.36
    You Save: $74.90
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Express | 2003-2021 | 4 Cyl 2.8L Diesel, 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.6L Diesel
    • GMC | Savana | 2003-2021 | 4 Cyl 2.8L Diesel, 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.6L, 8 Cyl 6.6L Diesel
    Less Info
  • GM Heater Core - 13406298
    View related parts
    GM Core Kit,Heater
    Part Number: 13406298
    Other Name: CORE KIT, Heater Core; Heater Core Replaces: 13263329, 20782084
    Your Price: $55.51
    Retail Price: $104.74
    You Save: $49.23
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Buick | Allure | 2010-2015 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.6L
    • Buick | LaCrosse | 2010-2016 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.6L
    • Buick | Regal | 2011-2017 | 4 Cyl 2.0L, 4 Cyl 2.4L
    • Buick | Verano | 2012-2017 | 4 Cyl 2.0L, 4 Cyl 2.4L
    • Cadillac | ELR | 2014-2016 | 4 Cyl 1.4L Flex
    • Cadillac | SRX | 2010-2016 | 6 Cyl 2.8L, 6 Cyl 3.0L, 6 Cyl 3.6L
    • Chevrolet | Cruze | 2011-2016 | 4 Cyl 1.4L, 4 Cyl 1.8L, 4 Cyl 2.0L Diesel
    • Chevrolet | Malibu | 2013-2016 | 4 Cyl 2.0L, 4 Cyl 2.4L, 4 Cyl 2.5L
    • Chevrolet | Orlando | 2012-2014 | 4 Cyl 2.4L
    • Chevrolet | Volt | 2011-2015 | 4 Cyl 1.4L Flex
    View More
    Less Info
  • GM Heater Core - 23135678
    View related parts
    GM Core Assembly, Heater
    Part Number: 23135678
    Other Name: CORE, Heater Core; Heater Core
    Your Price: $55.88
    Retail Price: $105.45
    You Save: $49.57
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Colorado | 2015-2021 | 4 Cyl 2.5L, 4 Cyl 2.8L Diesel, 6 Cyl 3.6L
    • GMC | Canyon | 2015-2021 | 4 Cyl 2.5L, 4 Cyl 2.8L Diesel, 6 Cyl 3.6L
    Less Info
  • GM Heater Core - 25882728
    View related parts
    GM Core Assembly, Auxiliary Heater
    Part Number: 25882728
    Other Name: CORE, Heater Core; Heater Core Replaces: 15225891
    Your Price: $69.50
    Retail Price: $131.14
    You Save: $61.64
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Cadillac | Escalade | 2007-2020 | 8 Cyl 6.2L, 8 Cyl 6.2L Flex
    • Chevrolet | Suburban | 2007-2020 | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L
    • GMC | Yukon | 2007-2020 | 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex, 8 Cyl 6.2L, 8 Cyl 6.2L Flex
    View More
    Less Info
  • GM Heater Core - 84206592
    View related parts
    GM Core Kit, Htr
    Part Number: 84206592
    Other Name: Evaporator Core, Heater Core
    Your Price: $79.60
    Retail Price: $150.18
    You Save: $70.58
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Buick | Cascada | 2016-2019 | 4 Cyl 1.6L
    • Buick | Enclave | 2018-2021 | 6 Cyl 3.6L
    • Cadillac | XT5 | 2017-2021 | 4 Cyl 2.0L, 6 Cyl 3.6L
    • Cadillac | XT6 | 2020-2021 | 6 Cyl 3.6L
    • Chevrolet | Blazer | 2019-2021 | 4 Cyl 2.0L, 4 Cyl 2.5L, 6 Cyl 3.6L
    • Chevrolet | Cruze | 2016-2019 | 4 Cyl 1.4L, 4 Cyl 1.6L Diesel
    • Chevrolet | Traverse | 2018-2021 | 4 Cyl 2.0L, 6 Cyl 3.6L
    • Chevrolet | Volt | 2016-2019 | 4 Cyl 1.5L
    • GMC | Acadia | 2017-2021 | 4 Cyl 2.0L, 4 Cyl 2.5L, 6 Cyl 3.6L
    View More
    Less Info
  • GM Heater Core - 25952917
    View related parts
    GM Core Assembly, Heater
    Part Number: 25952917
    Other Name: CORE, Heater Core; Heater Core
    Your Price: $79.71
    Retail Price: $167.48
    You Save: $87.77
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Equinox | 2010-2017 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.6L
    • GMC | Terrain | 2010-2017 | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.6L
    Less Info
  • GM Heater Core - 89018432
    View related parts
    GM Core Asm,Heater
    Part Number: 89018432
    Other Name: CORE, Heater Core; Heater Core Replaces: 52481264, 52470829
    Your Price: $93.22
    Retail Price: $195.84
    You Save: $102.62
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Malibu | 1997-2005 | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.1L
    • Oldsmobile | Achieva | 1997-1998 | 4 Cyl 2.4L, 6 Cyl 3.1L
    • Oldsmobile | Alero | 1999-2004 | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.4L
    • Oldsmobile | Cutlass | 1997-1999 | 6 Cyl 3.1L
    • Pontiac | Grand Am | 1999-2005 | 4 Cyl 2.2L, 4 Cyl 2.4L, 6 Cyl 3.4L
    View More
    Less Info
  • GM Heater Core - 23176934
    View related parts
    GM Core Kit, Heater
    Part Number: 23176934
    Other Name: CORE KIT, Heater Core; Heater Core
    Your Price: $74.92
    Retail Price: $141.36
    You Save: $66.44
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Buick | Envision | 2016-2020 | 4 Cyl 2.0L, 4 Cyl 2.5L
    • Chevrolet | Equinox | 2018-2021 | 4 Cyl 1.5L, 4 Cyl 1.6L Diesel, 4 Cyl 2.0L
    • GMC | Terrain | 2018-2021 | 4 Cyl 1.5L, 4 Cyl 1.6L Diesel, 4 Cyl 2.0L
    View More
    Less Info
  • GM Heater Core - 52493347
    View related parts
    GM Core Assembly, Heater
    Part Number: 52493347
    Other Name: CORE, Heater Core; Heater Core
    Your Price: $159.34
    Retail Price: $300.63
    You Save: $141.29
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Cobalt | 2005-2010 | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L
    • Chevrolet | HHR | 2006-2011 | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.2L Flex, 4 Cyl 2.4L
    • Pontiac | G5 | 2007-2010 | 4 Cyl 2.2L, 4 Cyl 2.4L
    • Pontiac | Pursuit | 2005-2006 | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L
    • Saturn | Ion | 2003-2007 | 4 Cyl 2.0L, 4 Cyl 2.2L, 4 Cyl 2.4L
    View More
    Less Info
  • GM Heater Core - 13514601
    View related parts
    GM Heater Assembly, Air
    Part Number: 13514601
    Other Name: Heater Core
    Your Price: $131.01
    Retail Price: $247.17
    You Save: $116.16
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Cruze | 2017-2019 | 4 Cyl 1.4L, 4 Cyl 1.6L Diesel
    • Chevrolet | Equinox | 2018-2019 | 4 Cyl 1.5L, 4 Cyl 1.6L Diesel, 4 Cyl 2.0L
    • Chevrolet | Silverado | 2016-2019 | 8 Cyl 6.6L Diesel
    • GMC | Sierra | 2016-2019 | 8 Cyl 6.6L Diesel
    • GMC | Terrain | 2018-2019 | 4 Cyl 1.5L, 4 Cyl 1.6L Diesel, 4 Cyl 2.0L
    View More
    Less Info
  • GM Heater Core - 19257319
    View related parts
    GM Core,Heater
    Part Number: 19257319
    Other Name: CORE, Heater Core; Heater Core Replaces: 19130301
    Your Price: $137.05
    Retail Price: $258.58
    You Save: $121.53
    Add to Cart
    More Info
    Fits the following GM Vehicles:
    • Chevrolet | Captiva Sport | 2012-2015 | 4 Cyl 2.4L, 6 Cyl 3.0L
    • Saturn | Vue | 2008-2010 | 4 Cyl 2.4L, 6 Cyl 3.5L, 6 Cyl 3.6L
    Less Info
| Page 1 of 9 |Next >
1-20 of 161 Results

Related GM Parts

About GM Heater Core

The most critical component to keeping a General Motors running smoothly is the Heater Core. Without a working GM Heater Core, your vehicle can suffer major performance issues and even automotive breakdown. With regular maintenance and replacement, you can save big by avoiding the hassle of an expensive repair jobs in the future.