This air door actuator directly replaces the original actuator on specific vehicle years, makes, models, configurations and positions to restore proper HVAC operation. Please note that many vehicles have several different air door actuators, which are designed for specific positions and functions in the vehicle. To ensure you have what you need, carefully review the application notes for this part to verify it matches the position and function of the actuator you need to replace. In some online ordering systems, you may need to enter your vehicle information first to see the application notes for your vehicle. If you don't know which actuator position you need to replace, consult a qualified service technician. This part is ompatible with the following vehicles. Before purchasing, enter your vehicle specifications in the Amazon Garage to confirm correct fitment. [Cadillac Escalade EXT: 2003, 2004, 2005, 2006] - [Chevrolet Avalanche 1500: 2003, 2004, 2005, 2006] - [Chevrolet Avalanche 2500: 2003, 2004, 2005, 2006] - [Chevrolet Cheyenne: 2003, 2004, 2005, 2006] - [Chevrolet Silverado 1500 Classic: 2007] - [Chevrolet Silverado 1500 HD Classic: 2007] - [Chevrolet Silverado 1500 HD: 2003, 2005, 2006] - [Chevrolet Silverado 1500: 2003, 2004, 2005, 2006] - [Chevrolet Silverado 2500 HD Classic: 2007] - [Chevrolet Silverado 2500 HD: 2003, 2004, 2005, 2006] - [Chevrolet Silverado 2500: 2003, 2004] - [Chevrolet Silverado 3500 Classic: 2007] - [Chevrolet Silverado 3500: 2003, 2004, 2005, 2006] - [GMC Sierra 1500 Classic: 2007] - [GMC Sierra 1500 HD Classic: 2007] - [GMC Sierra 1500 HD: 2003, 2005, 2006] - [GMC Sierra 1500: 2003, 2004, 2005, 2006] - [GMC Sierra 2500 HD Classic: 2007] - [GMC Sierra 2500 HD: 2003, 2004, 2005, 2006] - [GMC Sierra 2500: 2003, 2004] - [GMC Sierra 3500 Classic: 2007] - [GMC Sierra 3500: 2003, 2004, 2005, 2006] - [Hummer H2: 2003, 2004, 2005, 2006, 2007]