一、分區空調設置異常：被忽視的 “隱形殺手”

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

典型案例：濟南車主王先生的奔馳 GLC300 出現主駕駛側持續熱風，副駕駛側正常制冷。經檢查發現，空調面板的 “SYNC 同步模式” 被誤觸關閉，導致主駕駛溫度被鎖定在 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 ℃.

關鍵原理：奔馳雙區 / 多區空調通過獨立風門控制左右溫度，若未開啟 SYNC 模式，主駕駛側溫度設定會與副駕駛側分離。例如，若主駕駛誤將溫度旋鈕調至紅色區域，即使開啟 A/C 制冷，系統仍會優先輸出熱風。

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.

排查步驟：

Troubleshooting steps:

檢查空調面板是否顯示 “SYNC ON”，若關閉需長按 3 秒恢復同步。

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

確認主駕駛溫度旋鈕未調至最高溫（紅色區域），建議設定為 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 ℃.

若設置正常但故障依舊，需用奔馳專用診斷儀（如 XENTRY）讀取風門電機數據流，排查是否存在 “風門位置偏差” 故障碼。

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、風門執行器故障：最常見的硬件問題

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

故障表現：主駕駛側風門執行器（又稱 “混合風門電機”）卡滯或損壞，導致無法切換冷熱風通道。例如，奔馳 C200 和 GLC 車型因風門設計缺陷，保修期內可免費更換改良版部件。

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.

技術解析：

Technical analysis:

機械結構：風門執行器通過齒輪組控制金屬翻板，長期使用可能因潤滑失效或齒輪磨損導致卡滯。

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.

電路問題：電機繞組短路或 LIN 總線信號異常（如電壓低于 10V）會導致執行器停止工作。

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

診斷方法：

Diagnostic method:

手動測試：關閉發動機，拆下副駕駛儲物箱，手動撥動風門翻板（需戴手套防燙傷），若阻力過大則需更換。

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.

專業檢測：用診斷儀讀取風門電機電流（正常工作時約 0.5-1.2A），若電流異常或顯示 “執行器未校準”，需重新編程或更換。

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、溫度傳感器失效：系統誤判的根源

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

癥狀特征：主駕駛側溫度傳感器故障會導致空調系統誤判車內溫度，持續輸出熱風。例如，奔馳 E 級車型的車內溫度傳感器若被遮擋或受潮，可能顯示異常低溫（如 - 40℃），觸發系統強制制熱。

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.

檢測方案：

Testing plan:

電阻測量：拆下傳感器（通常位于儀表臺左側），用萬用表測量其電阻值。以 25℃為例，標準電阻應為 2.5kΩ，若實測值偏差超過 10% 則需更換。

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.

數據流分析：通過診斷儀查看 “車內溫度傳感器實際值” 與 “設定值” 的差異，若差值超過 3℃，需檢查傳感器線束是否斷路或搭鐵。

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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