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2026-08-31 · 3 min read

Radiator Fan Failure Symptoms — The Hidden Cause of Overheating

The radiator fan cools the engine at low speed and idle. When it fails, you might not notice until you're stuck in traffic — and the temperature gauge is climbing.

Radiator Fan Failure Symptoms — The Hidden Cause of Overheating

高速行驶时,车子前进产生的气流足以冷却水箱。低速或停车时,就靠散热风扇主动抽气。马来西亚常塞车,散热风扇非常重要——坏了就是引擎过热的隐患。

散热风扇坏了的症状

塞车或停红灯时水温上升,但高速行驶时温度正常——这是风扇故障最典型的表现。

引擎过热警示灯在低速情况下亮起。

冷气效果变差:冷气压缩机冷凝器也需要风扇帮助散热,风扇坏了冷气会变热。

掀开引擎盖观察:发动后怠速几分钟,正常车的风扇应该会转动。

常见故障原因

风扇继电器(relay)烧坏:最常见,继电器便宜好换。

风扇保险丝断掉:检查保险丝盒,找对应的风扇保险丝。

水温传感器故障:传感器读数不准,风扇收不到启动信号。

风扇电机损坏:需要更换整个风扇总成,费用较高。

为什么不能拖?

马来西亚路况塞车多,风扇坏了很快就会引发引擎过热。过热会损坏缸垫,修复费用极高(RM2,000 起)。发现异常要尽快检查,比换一个风扇继电器便宜得多。

结论

塞车水温高、冷气突然变热,先想到散热风扇。4M CARCARE 可快速检查风扇、继电器和传感器,找出根本原因。

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