Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Throttle Valve
| 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).
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.