Dorman's Belt Tensioner Pulley is engineered to maintain tension on the serpentine belt for the life of the belt--thereby keeping the alternator charging, the water pump running, and the power steering pump and A/C compressor operating properly. They feature a high-quality double-sealed bearing to resist damage from contaminants. Replacement prevents belt slip and eliminates squeak, squeal or groaning noise associated with a worn belt tensioner pulley. Vehicle model years this part fits: Buick Rainier: 2004, 2005, 2006, 2007 Cadillac Escalade ESV: 2003, 2004, 2005, 2006, 2007, 2008, 2009 Cadillac Escalade EXT: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Cadillac Escalade: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Chevrolet Avalanche 1500: 2002, 2003, 2004, 2005, 2006 Chevrolet Avalanche: 2007, 2008 Chevrolet Cargo Van: 2004 Chevrolet Express 1500: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Chevrolet Express 2500: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Chevrolet Express 3500: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Chevrolet Express 4500: 2009, 2010 Chevrolet Express Cargo: 2009, 2010 Chevrolet Express Pasajeros: 2009, 2010 Chevrolet Silverado 1500 Classic: 2007 Chevrolet Silverado 1500 HD Classic: 2007 Chevrolet Silverado 1500 HD: 2001, 2002, 2003, 2005, 2006 Chevrolet Silverado 1500: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Chevrolet Silverado 2500 HD: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Chevrolet Silverado 2500: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Chevrolet Silverado 3500 Classic: 2007 Chevrolet Silverado 3500 HD: 2008 Chevrolet Silverado 3500: 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009 Chevrolet Sonora: 2003, 2004, 2005, 2006 Chevrolet SSR: 2003, 2004, 2005, 2006 Chevrolet Suburban 1500: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Chevrolet Suburban 2500: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Chevrolet Tahoe: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Chevrolet Trailblazer EXT: 2003, 2004, 2005, 2006 Chevrolet Trailblazer: 2004, 2005, 2006, 2007, 2008, 2009 Chevrolet W3500 Tiltmaster: 2003, 2004, 2005, 2006, 2007, 2008 Chevrolet W4500 Tiltmaster: 2003, 2004, 2005, 2006, 2007, 2008 GMC Envoy XL: 2003, 2004, 2005, 2006 GMC Envoy XUV: 2004, 2005 GMC Envoy: 2005, 2006, 2007, 2008, 2009 GMC Savana 1500: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 GMC Savana 2500: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 GMC Savana 3500: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 GMC Sierra 1500 Classic: 2007 GMC Sierra 1500 HD Classic: 2007 GMC Sierra 1500 HD: 2001, 2002, 2003, 2005, 2006 GMC Sierra 1500: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 GMC Sierra 2500 HD Classic: 2007 GMC Sierra 2500 HD: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 GMC Sierra 2500: 1999, 2000, 2001, 2002, 2003, 2004 GMC Sierra 3500 Classic: 2007 GMC Sierra 3500 HD: 2007, 2008, 2009 GMC Sierra 3500: 2001, 2002, 2003, 2004, 2005, 2006 GMC Sierra: 2007, 2008, 2009 GMC W3500 Forward: 2004, 2005, 2006, 2007, 2008 GMC W4500 Forward: 2003, 2004, 2005, 2006, 2007, 2008 GMC Yukon XL 1500: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 GMC Yukon XL 2500: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 GMC Yukon: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Hummer H2: 2003, 2004, 2005, 2006, 2007, 2008, 2009 Hummer H3: 2008, 2009, 2010 Hummer H3T: 2009, 2010 Saab 9-7x: 2005, 2006, 2007, 2008, 2009