General description Replacement air door actuator controls the temperature of air from AC vents and recirculation/outside air into the interior of the vehicle. Technical specifications Manufacturer Part Number: 1638200108 Exchange part number: 604-938 Compatibility: 1998-2003 for ML320, 2003-2005 for ML350, 1999-2001 for ML430, 2002-2005 for ML500, 2000-2001 for ML55 Color: Black Material: ABS Measurement allowed error: +/- 1-3 cm Installation Quick and simple installation for a proper fitment on driver and passenger side. Recalibrate your HVAC system after installation. Other information Package Contents: 1 x HVAC Heater Blend Door Actuator Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product.