The function of the rear air conditioning duct assembly of the car
The rear air conditioning duct assembly for blowing air towards the face area of passengers in the rear seats is a key component of the vehicle's air conditioning system, specifically designed to deliver air to the face region of the rear passengers. Its core functions are as follows:
Directional air delivery enhances comfort: The adjusted cold or hot air is precisely conveyed through the duct to the face outlets at the rear, allowing rear passengers to directly feel the appropriate temperature airflow, especially in summer or winter, significantly improving the perceived comfort .
Independent air volume adjustment: In many models (such as the Shenzheng), this assembly shares the compressor with the front row, but allows rear passengers to individually control the air volume, achieving personalized temperature control .
Optimized interior air circulation: It helps balance the temperature differences between the front and rear of the vehicle, avoiding phenomena like "front cool and rear hot" or "front hot and rear stuffy", while promoting air circulation and improving air quality .
Reduces the risk of glass fogging: Reasonable air flow guidance can reduce the probability of fogging on the rear side windows and rear windshield, enhancing driving safety .
Integrated control and aesthetic design: Some new designs (such as the patent of Deep Blue Automobile) also integrate a touch screen, making it convenient for rear passengers to directly adjust the wind direction, wind volume, and enhance the interior's technological and premium feel .
This assembly is typically composed of duct pipes, outlet blades, damping mechanisms, snap base, and control panel, and must be precisely matched with the original factory duct cross-section and installation structure to ensure sealing, silence, and durability .
"Rear air conditioning duct assembly for blowing air towards the face" is not a standard term, but based on public information and the structure of the vehicle's air conditioning system, it can be understood as the air duct component in the rear exhaust outlet assembly specifically designed to direct cold or hot air towards the passenger's face area. Here is the summary of key information:
Core definition and function
Essentially: It is part of the vehicle's air conditioning ventilation system, located in the rear area (usually extending behind the center console of the front row), responsible for guiding the air processed by the evaporator box or warm air core to the face area of the rear passengers.
Core function: Achieve the "face blowing mode" (i.e., the airflow directly blows towards the head/face), enhancing the efficiency and comfort of temperature control;
Share the compressor and cold/hot source with the front row, but allow independent adjustment of the air volume;
The duct design affects the uniformity of air flow distribution, noise level, and whether there is a direct blowing discomfort.
Typical structure composition
Outlet blades: Adjustable angle to control the blowing direction;
Internal ducts: Precisely molded plastic ducts to ensure low turbulence and high air delivery efficiency;
Control panel/switches: Used to adjust the air volume or switch modes (some models are equipped);
Connection interface with the main unit: Matches the original factory air door actuator and CAN signal to ensure synchronous response. Notes for Attention
Non-independent cooling/heating unit: This assembly does not include a compressor, evaporator box or heating core; it only handles air flow direction. The true "blowing air" function relies on the front air conditioning assembly to complete heat exchange.
Importance of original factory matching: Non-original parts are prone to air leakage, abnormal noise or air flow separation due to deviation in duct cross-section or loose fasteners, affecting the actual feeling.
Faults in the rear air conditioning blowing air duct assembly of the car usually manifest as no air coming out from the rear outlet, weak air volume or abnormal air distribution mode. Based on the latest publicly available information as of April 2026, the main causes and recommended solutions for such faults are as follows:
Common fault causes
Outlet valve/air door failure
There are valves or air doors in the rear duct that control the direction and volume of air flow. After long-term use, plastic parts age and screws come loose, causing the valves to fail to open properly and blocking the air flow.
Duct sealing failure or damage
The shell of the evaporator box and connecting ducts, additional air pipes, etc. may leak due to aging, wear, or failure of the sealing ring, causing some or all of the air volume to be lost during transportation.
Air filter clogging
The filter has not been replaced for a long time (suggested replacement every 1–20,000 kilometers or 1–2 years), and accumulated dust severely hinders air circulation, especially affecting the rear air volume.
System setting issues
Some models have the "front priority" mode enabled, or the temperature is set too low (e.g., <16°C), causing the system to automatically shut off and no air is blown out .
Hardware faults
Blower motor or capacitor damage, resulting in insufficient wind speed (measured may be <0.5m/s)
Fault codes need to be read using a dedicated diagnostic instrument for control modules, motor drivers, etc.
Pipe structure defects
Non-original factory installed systems or improperly designed ducts with excessive length (>3 meters) and too many bends cause a wind pressure attenuation of more than 15%, affecting the rear air outflow .
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