KC4 Factory-verified

Chevrolet · Regular Production Option

Cooling system, engine oil

Years 1973–10, 2014–20, 2022–27 Models 43 Factory citations 261

Also described as Engine oil coolerEngine oil cooling, heavy dutyEngine oil cooling, heavy-dutyCooling system, engine oil coolerCooler, engine oilCooling, external engine oil coolerEngine oil cooling systemEngine oil cooler, heavy-dutyCooling, external engine oil cooler, heavy-dutyEngine oil cooler, external

Also documented for Buick Cadillac GMC Hummer Oldsmobile Pontiac Saturn

Documented applications

C/K Trucks

1973–82 Confirmed

—

Astro — First generation (1985–1994)

1986, 1987, 1990–1992 Factory-verified

included with Z82. 1986 from the 1986 cargo van pages in the kit file labelled 1985.

GM Heritage factory kit — 1985 Chevrolet Astro Van, p.26.
GM Heritage factory kit — 1987 Chevrolet Astro Van, p.26.
GM Heritage factory kit — 1990 Chevrolet Astro Van, p.7.
GM Heritage factory kit — 1991 Chevrolet Astro Van, p.11.
GM Heritage factory kit — 1992 Chevrolet Astro Van, p.32.

Avalanche — GMT800 (2002–2006)

2002–2006 Factory-verified

GM factory document — 2002 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2002 Chevrolet Avalanche, p.54.
GM Heritage factory kit — 2005 Chevrolet Avalanche, p.33.

Avalanche — GMT900 (2007–2013)

2007–2009 Factory-verified

The 2009 list words it as cooling system, engine oil.

GM factory document — 2007 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet avalanche 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet avalanche 2wd rpo code list, p.1.
GM Heritage factory kit — 2007 Chevrolet Avalanche, p.30.

Blazer (full-size, K Blazer) — GMT400 (1992–1994)

1992–1994 Factory-verified

engine oil cooler; included with Z82 (1992–1993); requires MM5 and L05 (1994); the 1992 option line runs the code into its restriction text (KC4Incl), so 1992 cites the trailering page that describes RPO KC4; the 1993 order guide prints KCA

GM Heritage factory kit — 1992 Chevrolet Blazer, p.20.
GM Heritage factory kit — 1993 Chevrolet Blazer, p.16.
GM Heritage factory kit — 1994 Chevrolet Blazer, p.9.

Blazer (full-size, K5) — Square body (1983–1991)

1983–1986, 1990, 1991 Factory-verified

the kits print it as the engine oil cooler; not with B3J diesel equipment; included with Z82; the 1984 option line prints KCA and the 1990 option line KC+, so 1984, 1990 and 1991 cite the pages that print KC4 only in the Z82 contents

GM Heritage factory kit — 1983 Chevrolet Blazer, p.9.
GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.20.
GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.11.
GM Heritage factory kit — 1986 Chevrolet Blazer, p.11.
GM Heritage factory kit — 1990 Chevrolet Blazer, p.16.
GM Heritage factory kit — 1991 Chevrolet Blazer, p.16.

S-10 Blazer — First generation (1983–1994)

1983–1989, 1991–1992 Factory-verified

the kits print it as the engine oil cooler; required with Z82 from 1991

GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.7.
GM Heritage factory kit — 1984 Chevrolet S 10 Blazer, p.7.
GM Heritage factory kit — 1985 Chevrolet S 10 Blazer, p.11.
GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.7.
GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.14.
GM Heritage factory kit — 1988 Chevrolet S 10 Blazer, p.10.
GM Heritage factory kit — 1989 Chevrolet Blazer, p.12.
GM Heritage factory kit — 1991 Chevrolet S 10 Blazer, p.17.
GM Heritage factory kit — 1992 Chevrolet S 10 Blazer, p.18.

Camaro — Gen 3 (1982–1992)

1987–1989 Factory-verified

GM Heritage factory kit — 1987 Chevrolet Camaro, p.15.
GM Heritage factory kit — 1988 Chevrolet Camaro, p.33.
GM Heritage factory kit — 1989 Chevrolet Camaro, p.36.

Camaro — Gen 4 (1993–2002)

1996 Factory-verified

GM Heritage factory kit — 1996 Chevrolet Camaro, p.117.

Camaro — Gen 6 Alpha (2016–2024)

2016, 2019, 2023 Factory-verified

GM factory document — 2016 chevrolet camaro fleet order guide wayback, p.1.
GM factory document — 2019 chevrolet camaro fleet order guide wayback, p.7.
GM factory document — 2023 chevrolet camaro fleet order guide wayback, p.4.

Caprice — fourth generation, B-body (1991–1996)

1994–1996 Factory-verified

the 1991 and 1992 sheets print KCA

GM Heritage factory kit — 1994 Chevrolet Caprice, p.67.
GM Heritage factory kit — 1995 Chevrolet Caprice, p.114.
GM Heritage factory kit — 1996 Chevrolet Caprice, p.116.

C/K pickup — GMT400 (1988–2000)

1988–2000 Factory-verified

GM factory document — 1998 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM factory document — 2000 chevrolet chevy c pickup 2wd rpo code list, p.1.
GM Heritage factory kit — 1988 Chevrolet Truck, p.140.
GM Heritage factory kit — 1989 Chevrolet Truck, p.24.
GM Heritage factory kit — 1990 Chevrolet Truck, p.32.
GM Heritage factory kit — 1991 Chevrolet Truck, p.31.
GM Heritage factory kit — 1992 Chevrolet Truck, p.29.
GM Heritage factory kit — 1993 Chevrolet Truck, p.14.
GM Heritage factory kit — 1994 Chevrolet Truck, p.19.
GM Heritage factory kit — 1995 Chevrolet Truck, p.13.
GM Heritage factory kit — 1996 Chevrolet Truck, p.24.
GM Heritage factory kit — 1997 Chevrolet Truck, p.102.

C/K pickup — Square body (1983–1991)

1985–1987 Factory-verified

the kits print it as the engine oil cooler

GM Heritage factory kit — 1985 Chevrolet Truck, p.21.
GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
GM Heritage factory kit — 1987 Chevrolet Truck, p.56.

Corvette — C4 (1984–1996)

1984–1994 Factory-verified

included in Z51 (1985–1990), and in Z52 in 1987–1988; the 1991 order guide (p.12) requires MN6 with it

GM Heritage factory kit — 1984 Chevrolet Corvette, p.18.
GM Heritage factory kit — 1985 Chevrolet Corvette, p.43.
GM Heritage factory kit — 1986 Chevrolet Corvette, p.106.
GM Heritage factory kit — 1987 Chevrolet Corvette, p.12.
GM Heritage factory kit — 1988 Chevrolet Corvette, p.32.
GM Heritage factory kit — 1989 Chevrolet Corvette, p.32.
GM Heritage factory kit — 1990 Chevrolet Corvette, p.14.
GM Heritage factory kit — 1991 Chevrolet Corvette, p.12.
GM Heritage factory kit — 1992 Chevrolet Corvette, p.32.
GM Heritage factory kit — 1993 Chevrolet Corvette, p.18.
GM Heritage factory kit — 1994 Chevrolet Corvette, p.63.

Express — GMT600 (1996–2002)

1998–2002 Factory-verified

the 2001–2002 lists read "Heavy Duty Engine Oil Cooling"

GM factory document — 1998 chevrolet express rpo code list, p.1.
GM factory document — 1999 chevrolet express rpo code list, p.1.
GM factory document — 2000 chevrolet express rpo code list, p.1.
GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.

Express — GMT610 (2003–2027)

2003–2010, 2014–2018, 2022–2027 Factory-verified

the 2003–2006 lists read Heavy Duty Engine Oil Cooling; the 2025–2027 guides read Cooling, external engine oil cooler; S: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2003 chevrolet express rpo code list, p.1.
GM factory document — 2004 chevrolet express awd rpo code list, p.1.
GM factory document — 2005 chevrolet express awd rpo code list, p.1.
GM factory document — 2006 chevrolet express rpo code list, p.1.
GM factory document — 2007 chevrolet express awd rpo code list, p.1.
GM factory document — 2008 chevrolet express rpo code list, p.1.
GM factory document — 2009 chevrolet express rpo code list, p.1.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.15.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.7.
GM factory document — 2015 chevrolet express savana electrical body builders manual service manual 2015 en us, p.13.
GM factory document — 2016 chevrolet express savana electrical body builders manual service manual 2016 en us, p.8.
GM factory document — 2017 chevrolet express savana electrical body builders manual service manual 2017 en us, p.8.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.16.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.13.
GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.14.
GM factory document — 2024 chevrolet 24 express savana body builder manual 18553161 2023oct26, p.14.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.12.
GM factory document — 2025 chevrolet express cargo fleet order guide, p.4.
GM factory document — 2025 chevrolet express cutaway fleet order guide, p.5.
GM factory document — 2025 chevrolet express passenger fleet order guide, p.5.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.12.
GM factory document — 2026 chevrolet express cargo fleet order guide, p.4.
GM factory document — 2026 chevrolet express cutaway fleet order guide, p.5.
GM factory document — 2026 chevrolet express passenger fleet order guide, p.4.
GM factory document — 2027 chevrolet express cargo fleet order guide, p.4.
GM factory document — 2027 chevrolet express cutaway fleet order guide, p.3.
GM factory document — 2027 chevrolet express passenger fleet order guide, p.4.

Chevy Van — Second generation G-series (1983–1996)

1983, 1984, 1986, 1988–1993 Factory-verified

engine oil cooler; 1984 from the 1984 data book pages in the kit file labelled 1985.

GM Heritage factory kit — 1983 Chevrolet Vandura, p.15.
GM Heritage factory kit — 1985 Chevrolet G Van, p.17.
GM Heritage factory kit — 1986 Chevrolet G Van, p.26.
GM Heritage factory kit — 1988 Chevrolet Vandura, p.20.
GM Heritage factory kit — 1989 Chevrolet G Van, p.17.
GM Heritage factory kit — 1990 Chevrolet G Van, p.19.
GM Heritage factory kit — 1991 Chevrolet G Van, p.28.
GM Heritage factory kit — 1992 Chevrolet G Van, p.20.
GM Heritage factory kit — 1993 Chevrolet G Van, p.15.

Lumina — second generation (1995–2001)

1996–1999 Factory-verified

GM factory document — 1998 chevrolet lumina rpo code list, p.1.
GM factory document — 1999 chevrolet lumina rpo code list, p.1.
GM Heritage factory kit — 1996 Chevrolet Lumina, p.102.
GM Heritage factory kit — 1997 Chevrolet Lumina, p.69.

Malibu — Fifth generation (1997–2005)

1998–2003 Factory-verified

GM factory document — 1998 chevrolet malibu rpo code list, p.1.
GM factory document — 1999 chevrolet malibu rpo code list, p.1.
GM factory document — 2000 chevrolet malibu rpo code list, p.1.
GM factory document — 2001 chevrolet malibu rpo code list, p.1.
GM factory document — 2002 chevrolet malibu rpo code list, p.1.
GM factory document — 2003 chevrolet malibu rpo code list, p.1.

Malibu — Sixth generation, Epsilon (2004–2008)

2004 Factory-verified

GM factory document — 2004 chevrolet malibu rpo code list, p.1.
GM Heritage factory kit — 2004 Chevrolet Malibu, p.37.

Monte Carlo — fifth generation, W-body (1995–1999)

1996, 1998–1999 Factory-verified

The 1995 and 1997 weight sheets print the code as KCA, so those years are left out.

GM factory document — 1998 chevrolet monte carlo rpo code list, p.1.
GM factory document — 1999 chevrolet monte carlo rpo code list, p.1.
GM Heritage factory kit — 1996 Chevrolet Monte Carlo, p.78.

S-10 pickup — First generation (1982–1993)

1983, 1985, 1988–1990, 1992 Factory-verified

GM Heritage factory kit — 1983 Chevrolet S 10, p.32.
GM Heritage factory kit — 1985 Chevrolet S 10, p.23.
GM Heritage factory kit — 1988 Chevrolet S 10, p.19.
GM Heritage factory kit — 1989 Chevrolet S 10, p.18.
GM Heritage factory kit — 1990 Chevrolet S 10, p.30.
GM Heritage factory kit — 1992 Chevrolet S 10, p.13.

Silverado — GMT800 (1999–2007)

1999–2007 Factory-verified

GM factory document — 1999 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Truck and Silverado, p.57.
GM Heritage factory kit — 2007 Chevrolet Silverado, p.59.

Silverado — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 chevrolet silverado 2wd rpo code list, p.1.

Silverado HD — GMT800 (2001–2007)

2001–2007 Factory-verified

GM factory document — 2001 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy c silverado 2wd rpo code list, p.1.
GM factory document — 2007 chevrolet silverado classic 2wd rpo code list, p.1.
GM Heritage factory kit — 2001 Chevrolet Silverado HD, p.62.
GM Heritage factory kit — 2003 Chevrolet Silverado 2500, p.215.
GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.163.

Silverado HD — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

GM factory document — 2007 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet silverado 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet silverado 3500hd cc fleet order guide wayback, p.4.

Silverado HD — K2XX (2015–2019)

2016–2019 Factory-verified

2017: GM's 2017 Silverado 2500HD order guide; 2018: GM's 2018 Silverado 2500HD order guide; 2019: GM's 2019 Silverado 2500HD order guide

GM factory document — 2016 chevrolet silverado 2500hd fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet silverado 2500hd order guide revised august 12 2016 copy gm authority, p.3.
GM factory document — 2018 chevrolet silverado 2500hd order guide copy gm authority, p.3.
GM factory document — 2019 chevrolet silverado 2500hd order guide april 20 2018 iteration 2 copy gm authority, p.3.

Silverado HD (T1XX, 2020–2027)

2023, 2025–2027 Factory-verified

only in: 2500 HD, 3500 HD, 3500 HD chassis cab

GM factory document — 2023 chevrolet 23silverado 2500 3500hd electrical body builder sm en us 2022oct12, p.11.
GM factory document — 2025 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.

Silverado — K2XX (2014–2019)

2015, 2017 Factory-verified

GM factory document — 2015 chevrolet silverado 1500 fleet order guide wayback, p.1.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.22.

Silverado — T1XX (2019–2026)

2020, 2022–2026 Factory-verified

GM factory document — 2020 chevrolet silverado 1500 fleet order guide wayback, p.1.
GM factory document — 2022 chevrolet 22 silverado 1500 new electrical body builder 042822, p.11.
GM factory document — 2023 chevrolet 23 silverado 1500 electrical body builder sm en us 2022oct24, p.12.
GM factory document — 2024 chevrolet 24 silverado1500 electrical body builder 2023nov29, p.14.
GM factory document — 2025 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 1500 retail and fleet fleet order guide rpo codes, p.1.

Suburban — GMT400 (1992–1999)

1992–1993, 1995–1999 Factory-verified

GM Heritage factory kit — 1992 Chevrolet Suburban, p.18.
GM Heritage factory kit — 1993 Chevrolet Suburban, p.4.
GM Heritage factory kit — 1995 Chevrolet Suburban, p.17.
GM Heritage factory kit — 1996 Chevrolet Suburban, p.7.
GM Heritage factory kit — 1997 Chevrolet Suburban, p.14.
GM factory document — 1998 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet chevy suburban 2wd rpo code list, p.1.

Suburban — GMT800 (2000–2006)

2000–2006 Factory-verified

GM factory document — 2000 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet chevy suburban 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Suburban, p.47.
GM Heritage factory kit — 2001 Chevrolet Suburban, p.51.
GM Heritage factory kit — 2002 Chevrolet Suburban, p.37.
GM Heritage factory kit — 2003 Chevrolet Suburban, p.38.
GM Heritage factory kit — 2004 Chevrolet Suburban, p.41.
GM Heritage factory kit — 2005 Chevrolet Suburban, p.161.

Suburban — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

The 2009 list words it as cooling system, engine oil. Trim marks in the 2014 guide: LS, LT, LTZ: O.

GM factory document — 2007 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet chevy suburban 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet suburban fleet order guide wayback, p.4.
GM Heritage factory kit — 2007 Chevrolet Suburban, p.154, p.157.

Suburban — K2XX (2015–2020)

2015–2019 Factory-verified

S on all trims; air-to-oil; 2018–2019 from GM's 2018 and 2019 Suburban order guides (GM Authority copies)

GM factory document — 2015 chevrolet suburban fleet order guide wayback, p.4, p.5.
GM factory document — 2016 chevrolet suburban fleet order guide wayback, p.4, p.5.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.10.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.22.
GM factory document — 2018 chevrolet suburban order guide copy gm authority, p.3.
GM factory document — 2019 chevrolet suburban order guide copy gm authority, p.4.

Suburban — Square body (1983–1991)

1984, 1985, 1987, 1989–1991 Factory-verified

the kits print it as the engine oil cooler; not with B3J; included with Z82; the 1986 and 1988 option lines print KCA and those pages name KC4 otherwise only as Z82 package content, so 1986 and 1988 are left out; 1990 and 1991 from the trailering equipment charts, and the 1991 option page also heads an engine oil cooler line with KC4 (OCR runs it into the next word)

GM Heritage factory kit — 1984 Chevrolet Suburban, p.19.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.18.
GM Heritage factory kit — 1987 Chevrolet Suburban, p.25.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.15.
GM Heritage factory kit — 1990 Chevrolet Suburban, p.27.
GM Heritage factory kit — 1991 Chevrolet Suburban, p.28.

Suburban — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2025 chevrolet new suburban fleet order guide, p.6.
GM factory document — 2026 chevrolet suburban fleet order guide, p.7.
GM factory document — 2027 chevrolet suburban fleet order guide, p.7.
GM factory document — 2022 chevrolet 22 suburban tahoe electrical body builder sm u 2021oct08, p.11.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.11.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.7.

Tahoe — GMT400 (1995–1999)

1995–1999 Factory-verified

GM factory document — 1998 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 1999 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 1995 Chevrolet Tahoe, p.15.
GM Heritage factory kit — 1996 Chevrolet Tahoe, p.18.
GM Heritage factory kit — 1997 Chevrolet Tahoe, p.14.
GM Heritage factory kit — 1998 Chevrolet Tahoe, p.42.
GM Heritage factory kit — 1999 Chevrolet Tahoe, p.14.

Tahoe — GMT800 (2000–2006)

2000–2006 Factory-verified

GM factory document — 2000 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2001 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2002 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2003 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2004 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2005 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2006 chevrolet tahoe 2wd rpo code list, p.1.
GM Heritage factory kit — 2000 Chevrolet Tahoe, p.47.
GM Heritage factory kit — 2001 Chevrolet Tahoe, p.44.
GM Heritage factory kit — 2002 Chevrolet Tahoe, p.30.
GM Heritage factory kit — 2003 Chevrolet Tahoe, p.31.
GM Heritage factory kit — 2006 Chevrolet Tahoe, p.152.

Tahoe — GMT900 (2007–2014)

2007–2009, 2014 Factory-verified

The 2009 list words it as cooling system, engine oil. Trim marks in the 2014 guides: Special Service: S.

GM factory document — 2007 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2008 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2009 chevrolet tahoe 2wd rpo code list, p.1.
GM factory document — 2014 chevrolet tahoe police vehicle fleet order guide wayback, p.4.
GM factory document — 2014 chevrolet tahoe special service vehicle fleet order guide wayback, p.4.
GM Heritage factory kit — 2007 Chevrolet Tahoe, p.180, p.182.

Tahoe — K2XX (2015–2020)

2015–2019 Factory-verified

S on all trims; air-to-oil; 2018–2019 from GM's 2018 and 2019 Tahoe order guides (GM Authority copies)

GM factory document — 2015 chevrolet tahoe fleet order guide wayback, p.1, p.5.
GM factory document — 2016 chevrolet tahoe fleet order guide wayback, p.4, p.5.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.10.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.22.
GM factory document — 2018 chevrolet tahoe order guide copy gm authority, p.3.
GM factory document — 2019 chevrolet tahoe order guide copy gm authority, p.3.

Tahoe — T1XX (2021–2027)

2022–2023, 2025–2027 Factory-verified

2027: S on all trims

GM factory document — 2025 chevrolet new tahoe retail and fleet fleet order guide, p.6.
GM factory document — 2026 chevrolet tahoe retail and fleet fleet order guide, p.6.
GM factory document — 2027 chevrolet tahoe retail and fleet fleet order guide, p.6.
GM factory document — 2027 chevrolet tahoe police package and special service fleet order guide, p.6.
GM factory document — 2022 chevrolet 22 suburban tahoe electrical body builder sm u 2021oct08, p.11.
GM factory document — 2023 chevrolet 23 suburban tahoe electrical body builder sm en us 2022sep13, p.11.
GM factory document — 2026 chevrolet suburban tahoe electrical body builder manual service manual 2026 en us, p.7.

Uplander (2005–2008)

2005–2008 Factory-verified

GM factory document — 2005 chevrolet uplander rpo code list, p.1.
GM factory document — 2006 chevrolet uplander rpo code list, p.1.
GM factory document — 2007 chevrolet uplander rpo code list, p.1.
GM factory document — 2008 chevrolet uplander rpo code list, p.1.

Venture — U-body minivan (1997–2005)

1998–2005 Factory-verified

the 1998–1999 lists require V08

GM factory document — 1998 chevrolet venture ext rpo code list, p.1.
GM factory document — 1999 chevrolet venture ext rpo code list, p.1.
GM factory document — 2000 chevrolet venture ext rpo code list, p.1.
GM factory document — 2001 chevrolet venture ext rpo code list, p.1.
GM factory document — 2002 chevrolet venture ext rpo code list, p.1.
GM factory document — 2003 chevrolet venture ext rpo code list, p.1.
GM factory document — 2004 chevrolet venture ext rpo code list, p.1.
GM factory document — 2005 chevrolet venture ext rpo code list, p.1.

This page aggregates every documented appearance of KC4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.