Holstein Parts Blower Motor Resistors are direct OE replacements for these critical interior heating and AC system components, offering perfect fit, form, and function for flawless operation that restores your vehicle to factory levels of performance Blower motor resistors are responsible for changing blower motor speed in response to dash control movement; a non-functioning or erratic blower motor is often a symptom of a bad or failing blower motor resistor Precision engineered sensor - manufactured from premium materials - exactly duplicates the function of the OE component, ensuring precise fan speed control for your vehicle OE matched connectors and terminals, made from premium materials, are used to ensure an accurate, easy connection to the vehicle's wiring harness Backed by Holstein Parts 3 year/36k mile warranty - we believe in our parts and our warranty shows it Compatible with select vehicles (Note: options/trim level may affect fitment - verify specific fitment details with fit checker above): BUICK: 2004-07 Rainier; CADILLAC: 2003-06 Escalade, 2003-06 Escalade ESV, 2003-06 Escalade EXT CHEVROLET: 2003-06 Avalanche 1500, 2003-06 Avalanche 2500, 1999-06 Silverado 1500, 2007 Silverado 1500 Classic, 2001-03,2005-06 Silverado 1500 HD, 2007 Silverado 1500 HD Classic, 2001-04 Silverado 2500, 2001-06 Silverado 2500 HD CHEVROLET: 2007 Silverado 2500 HD Classic, 2001-06 Silverado 3500, 2007 Silverado 3500 Classic, 2004-05 SSR, 2000-06 Suburban 1500, 2000-06 Suburban 2500, 2003-06 Tahoe, 2003-09 Trailblazer, 2003-04 Trailblazer EXT; GMC: 2003-09 Envoy GMC: 2003-06 Envoy XL, 2004-05 Envoy XUV, 1999-06 Sierra 1500, 2007 Sierra 1500 Classic, 2003,2005-06 Sierra 1500 HD, 2007 Sierra 1500 HD Classic, 2002-04 Sierra 2500, 2003-06 Sierra 2500 HD, 2007 Sierra 2500 HD Classic, 2001-06 Sierra 3500 GMC: 2007 Sierra 3500 Classic, 2003-06 Yukon, 2003-06 Yukon XL 1500, 2003-06 Yukon XL 2500; OLDSMOBILE: 2003-04 Bravada