If your Coolant Level Warning Light is on, it means the vehicle’s sensors have detected that the coolant level in the reservoir is low or that the sensor itself is faulty. Since coolant is essential for preventing overheating, this warning should never be ignored.

What does it mean if the Coolant Level Warning Light is on?

This light comes on when coolant levels drop below the safe minimum or when the coolant level sensor malfunctions. It’s designed to give you an early warning before the engine overheats and suffers damage.

Common causes of the Coolant Level Warning Light

• Low coolant due to leaks in the radiator, hoses, or water pump
• Evaporation or gradual fluid loss over time
• Faulty coolant level sensor giving false readings
• Damaged coolant reservoir or loose cap
• Electrical issues in the warning circuit

Why do you need to fix this problem quickly?

Coolant keeps your engine at the correct temperature. If the coolant level drops too low, the engine can overheat, causing severe damage such as a blown head gasket, warped cylinder head, or total engine failure.

How do you know when to get it checked?

You should book an inspection if:

• The warning light stays on after topping up coolant
• You see coolant leaks under the vehicle
• The temperature gauge is running hotter than normal
• You smell a sweet odour (sign of coolant leak)
• The light comes on and off intermittently

What happens during an assessment?

A mechanic will:

1. Check coolant levels and top up if required
2. Inspect the cooling system for leaks
3. Pressure test the radiator, hoses, and water pump
4. Test the coolant level sensor and wiring
5. Advise if the sensor or reservoir needs replacement

How much does it cost to fix?

If it’s just a top-up, the cost may be minimal. Leak repairs typically cost $200–$900. Coolant level sensor replacement costs around $180–$400. More complex repairs, such as radiator or head gasket issues, may range from $1,000–$3,500+.

Is it unsafe to drive with the Coolant Level Warning Light on?

Yes. If coolant levels are low, your engine can overheat quickly, leading to severe and expensive damage. If the light comes on, stop and check coolant levels immediately, and have the system inspected as soon as possible.