Heater, air conditioner duct, rear passenger

Years 1984, 2023–24, 2026 Models 2 Factory citations 4

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Also described as Cutaway van, heavy duty

Also documented for Chevrolet

Documented applications

Canyon — Third generation (VSS-T) (2023–2027)

2023–2024, 2026 Factory-verified

GM factory document — 2023 gmc 23canyon electrical body builder 2023march13, p.10.
GM factory document — 2024 gmc 24 canyon electrical body builder manual 2023oct04, p.10.
GM factory document — 2026 gmc canyon electrical body builder manual service manual 2026 en us, p.5.

Vandura and Rally — Second generation G-series (1983–1996)

1984 Factory-verified

the 1984 model table lists the G31603 H.D. cutaway as ZW9 and C7C; 1984 from the February 1984 data book pages in the mislabelled G-Van kit file; shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1985 Chevrolet G Van, p.79.

This page aggregates every documented appearance of C7C in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.