一、分区空调设置异常：被忽视的 “隐形杀手”

1、 Abnormal partition air conditioning settings: overlooked 'invisible killer'

典型案例：济南车主王先生的奔驰 GLC300 出现主驾驶侧持续热风，副驾驶侧正常制冷。经检查发现，空调面板的 “SYNC 同步模式” 被误触关闭，导致主驾驶温度被锁定在 28℃。

Typical case: Mr. Wang, the owner of a Mercedes Benz GLC300 in Jinan, experienced continuous hot air on the driver's side while the passenger side cooled normally. After inspection, it was found that the "SYNC synchronization mode" of the air conditioning panel was accidentally triggered and turned off, resulting in the driver's temperature being locked at 28 ℃.

关键原理：奔驰双区 / 多区空调通过独立风门控制左右温度，若未开启 SYNC 模式，主驾驶侧温度设定会与副驾驶侧分离。例如，若主驾驶误将温度旋钮调至红色区域，即使开启 A/C 制冷，系统仍会优先输出热风。

Key principle: Mercedes Benz dual zone/multi zone air conditioning controls the left and right temperatures through independent air doors. If SYNC mode is not turned on, the temperature setting on the driver's side will be separated from that on the passenger side. For example, if the driver accidentally adjusts the temperature knob to the red area, even if the A/C cooling is turned on, the system will still prioritize outputting hot air.

排查步骤：

Troubleshooting steps:

检查空调面板是否显示 “SYNC ON”，若关闭需长按 3 秒恢复同步。

Check if the air conditioning panel displays' SYNC ON '. If it is turned off, press and hold for 3 seconds to restore synchronization.

确认主驾驶温度旋钮未调至最高温（红色区域），建议设定为 22-24℃。

Confirm that the driver's temperature knob is not set to the highest temperature (red area), it is recommended to set it to 22-24 ℃.

若设置正常但故障依旧，需用奔驰专用诊断仪（如 XENTRY）读取风门电机数据流，排查是否存在 “风门位置偏差” 故障码。

If the setting is normal but the fault persists, a Mercedes Benz specialized diagnostic instrument (such as XENTRY) should be used to read the data stream of the air door motor and check for the existence of the "air door position deviation" fault code.

二、风门执行器故障：最常见的硬件问题

2、 Faulty air door actuator: The most common hardware issue

故障表现：主驾驶侧风门执行器（又称 “混合风门电机”）卡滞或损坏，导致无法切换冷热风通道。例如，奔驰 C200 和 GLC 车型因风门设计缺陷，保修期内可免费更换改良版部件。

Fault manifestation: The driver's side air door actuator (also known as the "hybrid air door motor") is stuck or damaged, resulting in the inability to switch between cold and hot air channels. For example, Mercedes Benz C200 and GLC models are eligible for free replacement of improved parts during the warranty period due to design defects in the air door.

技术解析：

Technical analysis:

机械结构：风门执行器通过齿轮组控制金属翻板，长期使用可能因润滑失效或齿轮磨损导致卡滞。

Mechanical structure: The damper actuator controls the metal flap through a gear set, and long-term use may cause jamming due to lubrication failure or gear wear.

电路问题：电机绕组短路或 LIN 总线信号异常（如电压低于 10V）会导致执行器停止工作。

Circuit issue: Short circuit of motor winding or abnormal LIN bus signal (such as voltage below 10V) can cause the actuator to stop working.

诊断方法：

Diagnostic method:

手动测试：关闭发动机，拆下副驾驶储物箱，手动拨动风门翻板（需戴手套防烫伤），若阻力过大则需更换。

Manual test: Turn off the engine, remove the passenger storage compartment, manually turn the air door flap (wear gloves to prevent burns), and replace it if the resistance is too high.

专业检测：用诊断仪读取风门电机电流（正常工作时约 0.5-1.2A），若电流异常或显示 “执行器未校准”，需重新编程或更换。

Professional testing: Use a diagnostic instrument to read the current of the air door motor (about 0.5-1.2A during normal operation). If the current is abnormal or displays "actuator not calibrated", it needs to be reprogrammed or replaced.

三、温度传感器失效：系统误判的根源

3、 Temperature sensor failure: the root cause of system misjudgment

症状特征：主驾驶侧温度传感器故障会导致空调系统误判车内温度，持续输出热风。例如，奔驰 E 级车型的车内温度传感器若被遮挡或受潮，可能显示异常低温（如 - 40℃），触发系统强制制热。

Symptom features: Malfunction of the temperature sensor on the driver's side can cause the air conditioning system to misjudge the temperature inside the car and continuously output hot air. For example, if the interior temperature sensor of the Mercedes Benz E-Class model is obstructed or dampened, it may display an abnormally low temperature (such as -40 ℃), triggering the system to force heating.

检测方案：

Testing plan:

电阻测量：拆下传感器（通常位于仪表台左侧），用万用表测量其电阻值。以 25℃为例，标准电阻应为 2.5kΩ，若实测值偏差超过 10% 则需更换。

Resistance measurement: Remove the sensor (usually located on the left side of the dashboard) and measure its resistance value with a multimeter. Taking 25 ℃ as an example, the standard resistance should be 2.5k Ω. If the measured value deviates by more than 10%, it needs to be replaced.

数据流分析：通过诊断仪查看 “车内温度传感器实际值” 与 “设定值” 的差异，若差值超过 3℃，需检查传感器线束是否断路或搭铁。

Data flow analysis: Use a diagnostic tool to check the difference between the "actual value of the in car temperature sensor" and the "set value". If the difference exceeds 3 ℃, check whether the sensor harness is open or grounded.

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