Coolant Temperature Warning Light
The coolant warning light shows that the engine is overheating or that the coolant level is too low.
What is Coolant Temperature Warning Light?
A red light usually means overheating; some cars show blue when the engine is still cold. A separate symbol may warn about low coolant level. Causes include leaks, a stuck thermostat, a failed fan or a water pump problem. Turning the heater to full heat and the fan to maximum can help shed some heat while you find a safe place to stop.
How it works
The temperature sensor and level sensor report to the control unit, which lights the symbol above set limits.
Why it matters for your car
Stop safely and switch off the engine if the light is red. Never open the hot expansion tank cap; pressurised coolant can cause burns.
Other terms
- Anti-roll Bar
- Automatic Transmission
- Battery Management System (BMS)
- Battery Passport (EU)
- Boost Leak
- Dipstick
- Distributor Cap And Rotor Arm
- Engine Displacement (Engine Capacity)
- EU Tyre Label
- Glovebox
- Immobilizer
- Mechanic’s Stethoscope
- Memory Seats
- MPV (People Carrier, Minivan)
- NOx (Nitrogen Oxides)
- Off-Peak Charging
- Paint Curing
- Technical Service Bulletin (TSB)
- Underbody Protection
- USB-C Port In The Car