The Air Door Actuator controls the flow and temperature of air in your vehicle's AC system. This part commonly fails on , , or GMC models leading incorrect air flow or temperatures inside your vehicle. The blend door actuator is easy to replace on your Silverado, Tahoe, GMC Sierra. Sometimes called the air heater blend door, this part is an essential part of your air conditioner system. Fits the following GM models:Model Years:1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 201299, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12 Make and Model:Silverado 1500 Silverado 2500 HD Chevy Tahoe GMC Sierra 1500Replaces part# 89018365 604-106 52402588 16163982 52402598 52402612This is not a genuine GM part, the terms , , GMC, and their associated models is used only to identify which vehicles this part fits. 2002-2003 Trailblazer & EXT model 2002-2003 GMC Envoy & XL model 1998-2002 Oldsmobile Intrigue 1998-2004 Cadillac Seville 2000-2005 Buick LeSabre 1995-1999 Buick Rivieria 1995-2003 Oldsmobile Aurora 2000-2005 Pontiac Bonneville 1997-2005 Buick Park Avenue 2003-2008 Isuzu Ascender 2004-2005 Buick Rainier​ 1998-2002 Blazer​ 1998-2002 S10 1998-2001 GMC Jimmy 1998-2002 GMC Sonoma 1997-2000 Pontiac Grand Prix 1997-2004 Corvette 1994-1996 Cadillac Fleetwood 1994-1996 Buick Roadmaster 1997-2004 Buick Regal 1997-2005 Buick Century 1998-2004 Oldsmobile Bravada