HVAC system, heater, outside air, deluxe

Years 1984–87, 1998–10, 2014–18, 2022–26 Models 13 Factory citations 49

Also described as Heater, front, heavy dutyHeater, deluxe, outside airHeater, deluxe, with defoggerHVAC system, heater, deluxeHeater, outside air, deluxe

Also documented for Chevrolet Oldsmobile

Documented applications

Canyon — GMT355 (2004–2012)

2004–2006 Factory-verified

GM factory document — 2004 gmc canyon pickup 2wd rpo code list, p.1.
GM factory document — 2005 gmc canyon pickup 2wd rpo code list, p.1.
GM factory document — 2006 gmc canyon pickup 2wd rpo code list, p.1.

Jimmy (full-size) — Square body (1983–1991)

1984–1986 Factory-verified

only with B3J diesel equipment; not with C60; the 1983 page prints the heater line without a code; shared square-body platform code; cited from the Chevrolet Blazer kit

GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.18.
GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.11.
GM Heritage factory kit — 1986 Chevrolet Blazer, p.12.

Jimmy — second generation (1995–2001)

1998–2001 Factory-verified

HVAC system in the 2000–2001 lists

GM factory document — 1998 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 1999 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2000 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2001 gmc jimmy 4wd rpo code list, p.1.

Safari — First generation (1985–1994)

1987 Factory-verified

the page prints deluxe heater and defogger; not with C60 or C69; shared M-body code; cited from the joint Astro/Safari pages of the Astro kits.

GM Heritage factory kit — 1987 Chevrolet Astro Van, p.27.

Savana — GMT600 (1996–2002)

1998–2002 Factory-verified

the 2001–2002 lists add outside air

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

Savana — GMT610 (2003–2027)

2003–2010, 2014–2018, 2022–2026 Factory-verified

GM factory document — 2003 gmc savana rpo code list, p.1.
GM factory document — 2008 gmc savana rpo code list, p.1.
GM factory document — 2008 chevrolet ld electricalfullsizevans, p.16.
GM factory document — 2009 gmc savana rpo code list, p.1.
GM factory document — 2009 chevrolet ld electricalfullsizevans 100813, p.14.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.14.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.6.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.15.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.12.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.11.

Sierra — GMT800 (1999–2007)

2003–2007 Factory-verified

GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2007 gmc sierra classic 2wd rpo code list, p.1.

Sierra — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2003–2007 Factory-verified

GM factory document — 2003 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2004 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2005 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2006 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2007 gmc sierra classic 2wd rpo code list, p.1.

Sierra HD — GMT900 (2007–2014)

2007–2009 Factory-verified

GM factory document — 2007 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2008 gmc sierra 2wd rpo code list, p.1.
GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Sierra — Square body (1983–1991)

1985–1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; not with C60 air conditioning

GM Heritage factory kit — 1985 Chevrolet Truck, p.43.
GM Heritage factory kit — 1986 Chevrolet Truck, p.158.
GM Heritage factory kit — 1987 Chevrolet Truck, p.58.

Sonoma — second generation (1994–2004)

1998–2004 Factory-verified

HVAC system in the 2000–2001 lists. The 2002–2004 lists read as the 2000–2001 lists.

GM factory document — 1998 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 1999 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2000 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2001 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2002 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2003 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2004 gmc sonoma pickup 4wd rpo code list, p.1.

Suburban — Square body (1983–1991)

1984, 1986 Factory-verified

only with B3J diesel equipment; not with C60 or C69; the 1985 page prints 642 and the 1987 page CAZ; shared square-body platform code; cited from the Chevrolet Suburban kit

GM Heritage factory kit — 1984 Chevrolet Suburban, p.22.
GM Heritage factory kit — 1986 Chevrolet Suburban, p.20.

This page aggregates every documented appearance of C42 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.