An adjustment device for adjusting shutoff elements of an air inlet of a motor compartment of a motor vehicle between at least a first position in which the air inlet is substantially closed and a second position in which the air inlet is substantially open, wherein the adjustment device is provided with a drive unit comprising an electric motor and a drive train having drive elements, wherein the electric motor drives the drive train, wherein the adjustment device is furthermore provided with a condition determining unit for determining a motion condition of at least one of the drive elements, wherein the condition determining unit includes a control element for controlling the drive unit based on the determined motion condition.