Summary:
Dashboard indicator lights can be confusing, especially if you haven’t memorized their meanings. One symbol that often causes confusion is the “boat” symbol, which isn’t actually a boat. It’s a thermometer over fluid, representing your coolant temperature warning system. This indicator may signal either low coolant temperature or a more serious overheating issue.
When the coolant temperature light turns on (outside of the usual moment during engine startup), it signals potential engine problems. The light’s color and behavior vary by car model and help diagnose the issue. For example, in a Subaru:
- A solid blue light means the engine hasn’t warmed up yet.
- A blinking red light indicates the engine is close to overheating.
- A light that switches between red and blue suggests an electrical system malfunction.
Honda notes that a red coolant temperature light may be caused by issues like a leaking radiator, a faulty thermostat, or a water pump failure.
If you see this warning, your response depends on the light’s behavior. A fluctuating light means you should have the car inspected by a professional. However, if the engine is overheating (red or blinking red light), you should stop driving as soon as it’s safe. Open the hood carefully and let the engine cool. Ignoring this warning can cause permanent engine damage.
After the engine cools down and the light turns off, it’s important to have a mechanic inspect the car to check for leaks or damage. Preventive action helps avoid long-term engine issues and costly repairs. In short, don’t ignore this light—it’s one of the most important warnings on your dashboard.
Family Handyman
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