[FUNCTION]: Replacement air door actuator controls the temperature of air from AC vents and recirculation/ outside air into the interior of the vehicle.<br> [EASY INSTALLATION]: Quick and simple installation for a proper fitment on driver and passenger side. Don't forget to recalibrate you HVAC system after installation.<br> Manufacturer Part Number: 1638200108<br> Exchange part number: 604-938, 163 of 820 01 08<br> Compatibility:<br> 1998-2003 for ML320<br> 2003-2005 for ML350<br> 1999-2001 for ML430<br> 2002-2005 for ML500<br> 2000-2001 for ML55<br> Colour:black<br> Material:ABS<br> Package Contents:<br> 1 x HVAC Heater Blend Door Actuator<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.