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2026-10-27 · 4 min read

Temperature Gauge Rises in Traffic — What's Wrong?

In Malaysia's stop-and-go traffic, the engine works hard but there's no airflow. If your temperature gauge climbs in jams but drops at speed, the cooling fan is usually the culprit.

Temperature Gauge Rises in Traffic — What's Wrong?

水温表平时在中间位置,但一进塞车就往上爬——这是马来西亚车主非常常见的投诉。好消息是这个症状本身已经缩小了很多排查范围。

为什么堵车时容易水温高?

正常行驶时,车子高速移动带来大量气流穿过水箱和冷凝器,帮助散热。

停车或极慢速行驶时,没有气流,引擎散热完全依赖冷却风扇(cooling fan)主动抽风。

如果风扇不够力或完全不工作,堵车时热量无法散出,水温就会升高。

高速后水温回落,是因为有了气流弥补了风扇的不足——这个「高速正常堵车高」的症状几乎 100% 指向冷却风扇系统。

冷却风扇问题的常见原因

风扇继电器(cooling fan relay)损坏:继电器失效,风扇完全不转。更换继电器通常费用低。

风扇马达(fan motor)老化:马达转速下降或间歇性不转,散热效率不够。

风扇温控开关(thermoswitch)或水温传感器失效:该触发风扇的温度到了,但传感器没有发出信号。

冷气开着通常强制风扇运转——所以有些车主发现开冷气水温正常,关冷气水温高,这也指向风扇问题。

其他可能原因

冷却液(coolant)不足:液位低,冷却系统循环量减少,散热能力下降。定期检查副水箱液位。

水箱外侧堵塞:大量虫尸、树叶、泥土堵住水箱散热片,阻碍散热。用水枪从引擎侧向外冲洗。

节温器(thermostat)卡住:节温器卡在关闭位置,冷却液无法流向大循环,堵车时热量积聚。

水温表升高时该怎么做?

打开暖气(heater)调到最热:暖气系统会把冷却液的热量带入车内,帮助散热,是临时应急措施。

开冷气:强制风扇运转,帮助散热。

水温继续升高接近红区:立即找地方安全停车,熄火,等引擎冷却后再检查。切勿打开水箱盖——热冷却液会喷出造成烫伤。

结论

堵车高速正常 = 冷却风扇问题,尽快检查风扇继电器和马达。4M CARCARE 冷却系统检查包括风扇、节温器、冷却液和水箱状态,来店告知症状即可。

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