What To Do Immediately
- If the temperature is high: stop safely and switch the engine off.
- If the gauge is normal: drive carefully to a safe location.
- Wait for the engine to cool: before checking coolant levels.
- Check for visible leaks: around hoses, radiator and underneath the car.
Common Causes Of Coolant Warning Lights
💧 Coolant Leak
Split hoses, leaking radiators, cracked expansion tanks and loose clamps.
🌀 Water Pump Fault
Leaking or failed water pumps can reduce coolant circulation.
🌡 Thermostat Problems
Sticking thermostats can cause overheating or unstable temperatures.
🧊 Cooling Fan Fault
Faulty cooling fans or blocked radiators reduce cooling performance.
🧯 Head Gasket Symptoms
Persistent coolant loss, overheating, pressure build-up or white smoke.
🧠 Sensor Faults
Faulty coolant level or temperature sensors can trigger warning lights incorrectly.
Can I Top Up Coolant?
Yes, but only when the engine is fully cool. Topping up may temporarily help, but the leak or cooling system fault still needs diagnosing properly.
How AutoAid Diagnoses Cooling System Faults
We inspect for leaks, pressure test the cooling system, check cooling fan operation and run diagnostic checks to identify the actual fault before repairs begin.
Coolant Warning Light On Now?
Send your registration number, postcode and a photo of the warning light for advice and availability.