Throttle Valve

Fig 1: Identifying Throttle Valve

Courtesy of VOLVO CARS CORPORATION

Number	Designation	Number	Designation
1	Defroster throttle valve	3	Floor throttle valve
2	Ventilation throttle valve	4	Temperature throttle valve

Air is led from the fan through the different air ducts out to the passenger compartment by changing the direction of the throttle valve in the distribution housing.

The temperature is controlled by mixing hot and cold air.

ETC has a temperature damper that is regulated by a damper motor.

ECC has a split temperature damper. The two parts are each controlled by a damper motor. This makes it possible to have different temperatures on the driver's side and the passenger side. The dampers are regulated proportionally to ensure that the passenger compartment achieves the selected temperature.

The throttle valve is controlled by several Damper motor modules (DMM).