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2026-09-18 · 4 min read

How Often to Change Coolant? Risks of Using the Wrong Type

Many owners think any water will do for the radiator. But coolant isn't just water — using the wrong type or leaving it too long can corrode your water pump and cause overheating.

How Often to Change Coolant? Risks of Using the Wrong Type

冷却液是什么?为什么不能用普通水?

冷却液(Coolant / Antifreeze)通常是乙二醇(Ethylene Glycol)与蒸馏水的混合液,并加入防锈剂和防腐添加剂。

马来西亚全年高温,冷却液的主要作用不是「防冻」(那是寒带国家的需求),而是:① 把沸点提高到 120°C 以上,防止引擎过热;② 防止冷却系统内部(铝合金水泵、铁制水箱、铝合金缸盖)生锈和腐蚀;③ 防止橡胶水管和密封圈老化。

直接用自来水会缺少防腐剂,容易生锈;而且自来水含有矿物质,会在冷却管道内形成水垢。

冷却液多久换一次?

普通冷却液(IAT,绿色):每 2 年或 40,000 公里

长效冷却液(OAT/HOAT,红/橙/粉红/蓝色):每 5 年或 100,000–150,000 公里

日本车(Toyota、Honda)和欧洲车(BMW、Mercedes)通常使用长效 OAT 型,颜色各异,不要混用不同品牌和类型。

如何判断冷却液是否需要更换?

• 颜色变成棕色或浑浊(正常应该是清亮的红/绿/蓝色)

• 水箱盖内侧有油膜或锈渣——可能是机油混入(头垫问题)

• 冷却液液位持续下降但找不到漏点——可能是内漏(头垫)

• 上次更换超过建议年限/里程

换错型号有什么后果?

不同配方的冷却液(如 IAT 和 OAT)混用会导致添加剂反应,产生胶状沉积物,堵塞冷却管道和散热器,反而加速腐蚀。

更换冷却液时,务必先完全排干并冲洗系统,再加入正确型号的冷却液。如不确定车型用哪种,来 4M CARCARE 换,我们会帮你选对规格。

换冷却液的费用

冷却液更换(含冲洗和正确型号冷却液):国产/日本车 RM 80–150,欧洲车(需要原厂规格冷却液)RM 150–280。这是非常划算的预防性保养,省去将来换水泵、水箱的费用。

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