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.
The dampers
- Temperature damper for controlling the heater element
- Temperature damper upstream of heating element
- Temperature damper downstream of heating element
- Defroster damper
- Ventilation damper
- Floor damper
- Fresh air damper
- Recirculation damper.
Dampers controlled by damper motors are located in the climate control system.
- Electronic climate control (ECC) has five damper motors
- Manual climate control (MCC) has four damper motors.
There are eleven different dampers controlling the air flow of the climate control unit:
- Six temperature dampers for mixing hot and cold air. Three for the left hand side and three for the right hand side. On each side one damper (2) is installed before and one damper (3) installed after the heater pad. Together (1) and (2) control the amount of air to be heated and (3) guides the warm air to the correct vent
- A floor vent for guiding the airflow to the front and rear of the floor
- A defroster damper for guiding the airflow to the front windshield and side windows.NOTE:
Electronic climate control (ECC) has a separate damper motor for the defroster damper.
- A ventilation shutter for guiding the airflow to the dashboard and B post
- A fresh air damper for controlling the flow of external air into the climate control system
- A recirculation damper for controlling the flow of the air in the passenger compartment back into the climate control system.
By changing the direction of the dampers in the climate control system, air is directed through the various air ducts out to the passenger compartment.
The temperature is regulated by mixing hot and cold air. The temperature dampers on the right and left sides are controlled by a damper motor each. 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 fresh air damper is speed controlled, which means that the damper reduces the size of the hole to the air inlet the higher the vehicle speed. At speeds above 60 km/h the fresh air damper closes successively. At speeds above 120 km/h the fresh air damper is nearly completely closed. The speed control of the fresh air is to keep the airflow in the passenger compartment constant, irrespective of the speed of the vehicle.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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