It is controlled by a blend door actuator which is a small electric motor.
2005 chevy impala blend door actuator.
When you turn the knob on your dash to the desired temperature the actuator moves the blend door to achieve the proper mix.
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As autos had more and more labor saving devices added as standard equipment heater and air conditioning controls could be operated with less effort when automakers started installing blend door actuators.
If you re only able to get cold or very hot air from your vents there may be a problem with the blend door or actuator.
An actuator moves the blend door automatically when the temperature control is moved.