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 52402612. This is not a genuine GM part 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 199