One Stop Solutions 99079 HVAC Heater Core - Front

OE-Style Heater Core Replacement

Restore cabin heat with this OSC Premium new HVAC heater core, part number 99079. It is built to match original equipment form and function for select Chevrolet, GMC, Cadillac, and Hummer applications, including Silverado, Sierra, Tahoe, Yukon, and Escalade models.

Compatible With 2000-2009 Chevrolet Silverado, GMC Sierra, Cadillac Escalade, and Hummer H2 heater core applications with the listed RPO and configuration notes.

• Premium aluminum construction
• Cadmium-plated tubes inside and out to resist premature failure
• Individually pressure tested before release
• Foam and related accessories included
• Direct replacement for copper-designed heater cores

Fitment Details

• Fits 2003-2009 Hummer H2, front, w/ RPO Code CJ3/D07
• Fits 2003-2007 Chevrolet Silverado 1500, front, w/ RPO Code CJ3/D07
• Fits 2007 Chevrolet Silverado 1500 Classic, N/A, W/AC
• Fits 2007 Chevrolet Silverado 1500 HD Classic, N/A, w/ Center Console
• Fits 2007 Chevrolet Silverado 2500 HD, front, w/ RPO Code CJ3/D07
• Fits 2007 Chevrolet Silverado 2500 HD Classic, N/A, W/AC
• Fits 2007 Chevrolet Silverado 3500 Classic, N/A, w/ Center Console
• Fits 2003-2007 GMC Sierra 1500, front, w/ RPO Code CJ3/D07
• Fits 2007 GMC Sierra 1500 Classic, N/A, wo/ ATC
• Fits 2007 GMC Sierra 1500 HD Classic, N/A, w/ Center Console
• Fits 2003-2007 GMC Sierra 2500 HD, front, w/ RPO Code CJ3/D07
• Fits 2007 GMC Sierra 2500 HD Classic, N/A, w/ Center Console
• Fits 2007 GMC Sierra 3500 Classic, front, w/ RPO Code CJ3/D07
• Fits 2002-2006 Cadillac Escalade, front, w/ RPO Code CJ3/D07
• Fits 2003-2006 Cadillac Escalade ESV, front, w/ RPO Code CJ3/D07
• Fits 2002-2006 Cadillac Escalade EXT, front, w/ RPO Code CJ3/D07
• Fits 2002-2006 Chevrolet Avalanche 1500, front, w/ RPO Code CJ3/D07
• Fits 2002-2006 Chevrolet Avalanche 2500, front, w/ RPO Code CJ3/D07
• Fits 2005-2006 Chevrolet Silverado 1500 HD, front, w/ RPO Code CJ3/D07
• Fits 2003 Chevrolet Silverado 1500 HD, front, w/ RPO Code CJ3/D07
• Fits 2003-2006 Chevrolet Silverado 2500, front, w/ RPO Code CJ3/D07
• Fits 2003-2006 Chevrolet Silverado 2500 HD, N/A, W/AC
• Fits 2003-2006 Chevrolet Silverado 3500, front, w/ RPO Code CJ3/D07
• Fits 2000-2006 Chevrolet Suburban 1500, front, w/ RPO Code CJ3/D07
• Fits 2000-2006 Chevrolet Suburban 2500, front, w/ RPO Code CJ3/D07
• Fits 2000-2006 Chevrolet Tahoe, front, w/ RPO Code CJ3/D07
• Fits 2005-2006 GMC Sierra 1500 HD, front, w/ RPO Code CJ3/D07
• Fits 2003 GMC Sierra 1500 HD, front, w/ RPO Code CJ3/D07
• Fits 2003-2006 GMC Sierra 3500, front, w/ RPO Code CJ3/D07
• Fits 2000-2006 GMC Yukon, front, w/ RPO Code CJ3/D07
• Fits 2000-2006 GMC Yukon XL 1500, front, w/ RPO Code CJ3/D07
• Fits 2000-2006 GMC Yukon XL 2500, front, w/ RPO Code CJ3/D07
• Fits 2003-2004 GMC Sierra 2500, front, w/ RPO Code CJ3/D07

What This Part Helps Address

• Weak or inconsistent cabin heat
• Leaking heater core coolant loss
• Fogging from an internal HVAC leak
• Corrosion-related heater core failure
• Replacement needs after HVAC service

Installation Notes

Verify the vehicle’s RPO code and HVAC configuration before ordering, since several applications are tied to CJ3/D07, center console, or A/C-specific notes. This heater core is a direct replacement for copper-style units and is intended for front HVAC locations where listed.

This part cross-references Dorman - HELP 99374 for the same application.

Quality Assurance

OSC Premium heater cores are individually pressure tested and built from aluminum with cadmium-plated tubes to help resist early failure. Part number 99079 is engineered as an OE-style replacement for select Chevrolet Silverado, GMC Sierra, Cadillac Escalade, and Hummer H2 heater core applications.