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What is the air conditioner part behind dash in Chevrolet trucks?

The part behind the dash in a Chevrolet truck responsible for air conditioning is the HVAC (Heating, Ventilation, and Air Conditioning) system's blower motor and associated components. This isn't one single part, but a collection:

* Blower Motor: This is the fan that moves air through the system.

* Blower Motor Resistor: Controls the fan speed. A faulty resistor is a common cause of blower motor problems.

* HVAC Control Module (or blend door actuators): These electronic components control the direction (vents, defrost, floor) and temperature of the air. They operate the various blend doors within the system.

* Ducts and Vents: The network of tubes and openings that distribute the air throughout the cabin.

While you might see the blower motor itself relatively easily by removing parts of the dash, other components like the control module are more deeply embedded within the dash assembly.