What does it mean when the coolant warning light comes on?

2 Answers
MacNolan
07/25/25 12:11am
The coolant warning light indicates to the driver that there is an abnormality in the engine or its control system, requiring maintenance. This issue requires professional diagnostic testing, using a decoder to read the fault codes stored in the system. Based on the fault codes, the location and cause of the issue can be determined. Therefore, it is important to promptly visit a professional repair shop for diagnostics and avoid continuing to use the vehicle. Below is an introduction to the engine warning light: 1. Engine warning light: If the engine warning light stays on, it means the vehicle has a fault code. In this case, if the ECU is not powered off, the fault code will be recorded. Using a code reader at a 4S shop can determine the fault code and the corresponding issue. Additionally, confirm whether the previous fault code was completely cleared. 2. Damaged radiator cap: Check if the main radiator cap is damaged. The radiator cap is very important. During high temperatures, the expanding coolant flows into the auxiliary reservoir through the radiator cap, and when the engine is cold, the cap opens to allow coolant to circulate back into the main radiator.
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SanTeagan
08/10/25 3:39pm
Last time the coolant warning light came on, I almost panicked, but recalling my driving experience, I realized it's usually due to low coolant levels. It could be a small leak in the radiator or a loose cap, causing the level to drop slowly. Once, my car's light came on during a long trip. I immediately pulled over to check and saw the coolant reservoir level was below the minimum mark. I quickly added some distilled water as an emergency measure. Later at the repair shop, they found the radiator hose had aged and was leaking. If you ignore this warning light, the engine temperature can skyrocket, and in severe cases, the cylinder head may warp or burn out, costing thousands in repairs. So I recommend pulling over to check the coolant level as soon as the light comes on, topping up with appropriate coolant, and consulting a professional if the issue persists—don't delay.
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