# Wehrli 99-23 GM Billet Coolant Heater Core Firewall Fitting The factory plastic GM Coolant Heater Core Firewall Fitting is a common failure point on Duramax trucks and other GM vehicles. Our made in the USA, billet aluminum direct-fit replacement is more resistant to heat and vibration. Prevent leaks with this easy to install upgrade. Replaces GM/AC Delco Part Number 15032062 - Replaces failure prone plastic factory GM Heater Core Firewall Coolant Fitting - Billet direct-fit replacement with 5/8" barb connection - Clear Anodized finished to resist corrosion - Replaces GM/AC Delco Part Number 15032062 - More resistant to heat and vibration - Double O-ring seal This Part Fits: Year Make Model Submodel 2002-2005 Cadillac Escalade Base 2002-2005 Chevrolet Avalanche 1500 Base 2005 Chevrolet Avalanche 1500 LS 2005 Chevrolet Avalanche 1500 LT 2002-2003 Chevrolet Avalanche 1500 North Face 2002-2003 Chevrolet Avalanche 1500 On Road Edition 2003 Chevrolet Avalanche 1500 WBH 2004-2005 Chevrolet Avalanche 1500 Z66 2002-2005 Chevrolet Avalanche 1500 Z71 2002-2004 Chevrolet Avalanche 2500 Base 2005 Chevrolet Avalanche 2500 LS 2005 Chevrolet Avalanche 2500 LT 2007-2010 Chevrolet Express 1500 Base 2007-2010 Chevrolet Express 1500 LS 2007-2010 Chevrolet Express 1500 LT 2007-2010 Chevrolet Express 2500 Base 2007-2010 Chevrolet Express 2500 LS 2007-2010 Chevrolet Express 2500 LT 2007-2010 Chevrolet Express 3500 Base 2007-2010 Chevrolet Express 3500 LS 2007-2010 Chevrolet Express 3500 LT 1999-2005 Chevrolet Silverado 1500 Base 2004-2006,2009-2013 Chevrolet Silverado 1500 Hybrid 1999-2013 Chevrolet Silverado 1500 LS 1999-2013 Chevrolet Silverado 1500 LT 2007-2013 Chevrolet Silverado 1500 LTZ 2003-2006 Chevrolet Silverado 1500 SS 2002-2013 Chevrolet Silverado 1500 WT 2010-2013 Chevrolet Silverado 1500 XFE 2004-2005 Chevrolet Silverado 1500 Z71 Off-Road 2000-2004 Chevrolet Silverado 2500 Base 2000-2004 Chevrolet Silverado 2500 LS 2000-2004 Chevrolet Silverado 2500 LT 2004 Chevrolet Silverado 2500 WT 2001-2005 Chevrolet Silverado 2500 HD Base 2021-2023 Chevrolet Silverado 2500 HD Custom 2015-2023 Chevrolet Silverado 2500 HD High Country 2001-2006 Chevrolet Silverado 2500 HD LS 2001-2023 Chevrolet Silverado 2500 HD LT 2007-2023 Chevrolet Silverado 2500 HD LTZ 2003-2023 Chevrolet Silverado 2500 HD WT 2007 Chevrolet Silverado 2500 HD Classic LS 2007 Chevrolet Silverado 2500 HD Classic LT 2007 Chevrolet Silverado 2500 HD Classic WT 2001-2005 Chevrolet Silverado 3500 Base 2001-2006 Chevrolet Silverado 3500 LS 2001-2006 Chevrolet Silverado 3500 LT 2004,2006 Chevrolet Silverado 3500 WT 2007 Chevrolet Silverado 3500 Classic LS 2007 Chevrolet Silverado 3500 Classic LT 2007 Chevrolet Silverado 3500 Classic WT 2015-2023 Chevrolet Silverado 3500 HD High Country 2007-2023 Chevrolet Silverado 3500 HD LT 2007-2023 Chevrolet Silverado 3500 HD LTZ 2007-2023 Chevrolet Silverado 3500 HD WT 2000-2001 Chevrolet Suburban 1500 Base 2000-2005 Chevrolet Suburban 1500 LS 2000-2005 Chevrolet Suburban 1500 LT 2002-2005 Chevrolet Suburban 1500 Z71 2000-2001 Chevrolet Suburban 2500 Base 2000-2005 Chevrolet Suburban 2500 LS 2000-2005 Chevrolet Suburban 2500 LT 2000-2001 Chevrolet Tahoe Base 2000 Chevrolet Tahoe Limited 2000-2004 Chevrolet Tahoe LS 2000-2004 Chevrolet Tahoe LT 2000,2002-2004 Chevrolet Tahoe Z71 2007-2010 GMC Savana 1500 Base 2007-2010 GMC Savana 1500 LS 2007-2010 GMC Savana 1500 LT 2007-2010 GMC Savana 2500 Base 2007-2010 GMC Savana 2500 LS 2007-2010 GMC Savana 2500 LT 2007-2010 GMC Savana 3500 Base 2007-2010 GMC Savana 3500 LS 2007-2010 GMC Savana 3500 LT 2002-2005 GMC Sierra 1500 Base 2001 GMC Sierra 1500 C3 2002-2013 GMC Sierra 1500 Denali 2002 GMC Sierra 1500 HT 2005-2006,2009-2013 GMC Sierra 1500 Hybrid 1999-2003,2006-2013 GMC Sierra 1500 SL 1999-2013 GMC Sierra 1500 SLE 1999-2013 GMC Sierra 1500 SLT 2002-2013 GMC Sierra 1500 WT 2010-2013 GMC Sierra 1500 XFE 2020-2023 GMC Sierra 2500 HD AT4 2002-2005,2015-2021 GMC Sierra 2500 HD Base 2011-2023 GMC Sierra 2500 HD Denali 2022-2023 GMC Sierra 2500 HD Pro 2001-2002,2006 GMC Sierra 2500 HD SL 2001-2023 GMC Sierra 2500 HD SLE 2001-2023 GMC Sierra 2500 HD SLT 2003-2014 GMC Sierra 2500 HD WT 2007 GMC Sierra 2500 HD Classic SL 2007 GMC Sierra 2500 HD Classic SLE 2007 GMC Sierra 2500 HD Classic SLT 2007 GMC Sierra 2500 HD Classic WT 2002-2005 GMC Sierra 3500 Base 2001-2002,2006 GMC Sierra 3500 SL 2001-2006 GMC Sierra 3500 SLE 2001-2006 GMC Sierra 3500 SLT 2004-2006 GMC Sierra 3500 WT 2007 GMC Sierra 3500 Classic SL 2007 GMC Sierra 3500 Classic SLE 2007 GMC Sierra 3500 Classic SLT 2007 GMC Sierra 3500 Classic WT 2020-2023 GMC Sierra 3500 HD AT4 2015-2021 GMC Sierra 3500 HD Base 2011-2023 GMC Sierra 3500 HD Denali 2022-2023 GMC Sierra 3500 HD Pro 2007-2023 GMC Sierra 3500 HD SLE 2007-2023 GMC Sierra 3500 HD SLT 2007-2014 GMC Sierra 3500 HD WT 2000-2005 GMC Yukon Denali 2000-2005 GMC Yukon SLE 2000-2005 GMC Yukon SLT 2003-2009 Hummer H2 Base ## Details - **Price:** 80.47 CAD - **Vendor:** Wehrli - **Type:** Coolant Reservoirs ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 80.47 CAD | In stock | ## Images - Photo - Primary - User 1 - Logo Image --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/wehrli-99-23-gm-billet-coolant-heater-core-firewall-fitting) > Updated: 2026-07-03