Cooling system, heavy duty

Years 1985, 1987–89, 1996, 2002–09, 2018, 2022–23, 2025–27 Models 7 Factory citations 19

Also described as Heavy-duty engine and transmission coolingCooling system, heavy-dutyCooling, heavy duty, engine and transmission

Also documented for Cadillac Chevrolet GMC Oldsmobile Pontiac Saturn

Documented applications

Century — A-body (1982–1996)

1985, 1987–1989, 1996 Single-source

1996 from the 1996 Buick Century brochure, which prints V08 and ties it to the 3.1 V6's 2,000 lb trailer rating; 1985 and 1987–1989 from the Chevrolet Celebrity kits, which call it heavy-duty cooling (a shared A-body cooling code) (the 1987 page prints VO8); 1984 is left out because the page that lists it prints its model-year field as 7984, which is not a readable year; 1986 and 1990 are left out because those pages print YO8 and VOB

GM Heritage factory kit — 1985 Chevrolet Celebrity, p.44.
GM Heritage factory kit — 1987 Chevrolet Celebrity, p.43.
GM Heritage factory kit — 1988 Chevrolet Celebrity, p.47.
GM Heritage factory kit — 1989 Chevrolet Celebrity, p.11.

Enclave — C1XX (2018–2024)

2018, 2022–2023 Factory-verified

included only with V92 (all trims where V92 is offered); 2018: GM order guide via GM Authority

GM factory document — 2018 buick enclave order guide copy gm authority, p.23, p.38.
GM factory document — 2022 buick enclave order guide copy nhtsa docket, p.31.
GM factory document — 2023 buick enclave order guide copy autoevolution wayback, p.29.

Enclave — Lambda / GMT967 (2008–2017)

2008–2009 Factory-verified

GM factory document — 2008 buick enclave rpo code list, p.1.
GM factory document — 2009 buick enclave rpo code list, p.1.

Enclave — VSS-S (2025–2027)

2025–2027 Factory-verified

2025: O on all trims; 2026–2027: S on all trims

GM factory document — 2025 buick all new enclave fleet order guide, p.25.
GM factory document — 2026 buick enclave fleet order guide, p.8.
GM factory document — 2027 buick enclave fleet order guide, p.8.

Regal — G-body (1983–1987)

1987 Confirmed

not with LC2 or WE2; gnttype.org's 1987 option sheet

Rendezvous — U-body / GMT257 (2002–2007)

2002–2007 Factory-verified

The 2002 to 2005 lists print VO8 (letter O); the 2006 and 2007 lists print V08 (zero), which is the code.

GM factory document — 2002 buick rendezvous awd rpo code list, p.1.
GM factory document — 2003 buick rendezvous awd rpo code list, p.1.
GM factory document — 2006 buick rendezvous awd rpo code list, p.1.
GM factory document — 2007 buick rendezvous fwd rpo code list, p.1.

Terraza — U-body / GMT201 (2005–2007)

2005–2007 Factory-verified

GM factory document — 2005 buick terraza rpo code list, p.1.
GM factory document — 2006 buick terraza rpo code list, p.1.
GM factory document — 2007 buick terraza rpo code list, p.1.

This page aggregates every documented appearance of V08 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.