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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    KC4 Factory-verified

    GMC · Regular Production Option

    Cooling system, engine oil

    Years 1983–91, 1998–10, 2014–20, 2022–27 Models 26 Factory citations 131
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    Also described as Cooling system, engine oil coolerEngine oil cooler, heavy-dutyCooling, external engine oil coolerEngine oil cooling, heavy-dutyCooling, external engine oil cooler, heavy-dutyEngine oil cooler, external

    Also documented for BuickCadillacChevroletHummerOldsmobilePontiacSaturn

    Documented applications

    Jimmy (full-size) — Square body (1983–1991)
    • 1983, 1985, 1986 Factory-verified

      the kits print it as the engine oil cooler; not with B3J diesel equipment; included with Z82; 1990 is left out: the powertrain page names KC4 only in a requirement footnote (the 1990 option line prints KC+); the 1984 option lines print KO2 and KCA, and the 1984 and 1991 books otherwise name KC4 only in the Z82 contents or, in 1991, in a requirement footnote with no engine oil cooler option line, so 1984 and 1991 are left out (the Chevrolet K5 Blazer doc claims them from the Z82 contents); shared square-body platform code; cited from the Chevrolet Blazer kit

      GM Heritage factory kit — 1983 Chevrolet Blazer, p.9.
      GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.11.
      GM Heritage factory kit — 1986 Chevrolet Blazer, p.11.
    Jimmy — first generation (1983–1994)
    • 1983–1986, 1988–1989 Factory-verified

      the kits print it as the engine oil cooler; shared S/T platform code; cited from the joint S-10/15 Blazer/Jimmy pages of the S-10 Blazer kit

      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 — 1988 Chevrolet S 10 Blazer, p.10.
      GM Heritage factory kit — 1989 Chevrolet Blazer, p.12.
    Safari — First generation (1985–1994)
    • 1986, 1987, 1990 Factory-verified

      included with Z82; 1986 from the 1986 pages in the kit file named for the prior model year; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

      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.
    Savana — GMT610 (2003–2027)
    Sierra HD — GMT800 (2001–2007)
    Sierra HD — T1XX (2020–2027)
    Sierra — K2XX (2014–2019)
    Sierra — Square body (1983–1991)
    • 1983–1987 Factory-verified

      shared platform code; cited from the square-body C/K pickup kits; the kits print it as the engine oil cooler; 1987 from the air conditioning entry’s requirement remark

      GM Heritage factory kit — 1983 Chevrolet Truck, p.18.
      GM Heritage factory kit — 1984 Chevrolet Truck, p.26.
      GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
      GM Heritage factory kit — 1986 Chevrolet Truck, p.159.
      GM Heritage factory kit — 1987 Chevrolet Truck, p.56.
    Sierra — T1XX (2019–2026)
    Sonoma — first generation (1982–1993)
    • 1983, 1985, 1988–1990 Factory-verified

      shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

      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.86.
      GM Heritage factory kit — 1989 Chevrolet S 10, p.18.
      GM Heritage factory kit — 1990 Chevrolet S 10, p.30.
    Suburban — Square body (1983–1991)
    • 1984, 1985, 1987, 1989–1991 Single-source

      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); shared square-body platform code; cited from the Chevrolet Suburban kit; 1991 rests on the Chevrolet-only 1991 Suburban book, so the row is single-source

      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.
    Vandura and Rally — Second generation G-series (1983–1996)
    • 1983, 1984, 1986, 1988–1990 Factory-verified

      engine oil cooler; 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 — 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.
    Yukon — GMT800 (2000–2006)
    Yukon — K2XX (2015–2020)
    Yukon — T1XX (2021–2027)
    Yukon XL — K2XX (2015–2020)
    Yukon XL — T1XX (2021–2027)

    Related codes · mentioned in these notes

    1LS1LT1WT2WTB3JKCAZ82

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