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In most vehicles, you'll find the blend door actuator positioned closer to the heater core and evaporator compared to the mode door. The blend door actuator plays a crucial role in detecting your adjustments on the climate control system and transmitting those signals accurately. This involves actions like adjusting the temperature and controlling airflow from the vents. If the sensor malfunctions, the climate control system may exhibit various issues such as being unable to switch between hot and cold air, limited airflow from the vents, or complete system failure. Replacing the sensor at a mechanic's shop typically costs around $300 in total.
The 2007 Chevy Silverado's blend door actuator is located on the side of the HVAC plenum.
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