ARM Cars editorial guide · Reviewed 3 November 2026
Stop safely
If an overheating warning appears, find a safe place to stop and follow the handbook. Switch off the engine when safe. Do not continue simply because home or a garage is close. Steam, a rising temperature gauge or coolant smell needs assessment.
Do not open a hot cooling system
Hot pressurised coolant can cause serious burns. Do not remove a radiator or pressurised reservoir cap while hot, and keep clear of steam and moving fans. Avoid adding random fluids or treating a top-up as proof the cause is fixed.
Describe the event
Record the warning, driving conditions and any visible leak from a safe distance. Arrange recovery or professional advice rather than attempting a roadside repair. Ask for the cause to be investigated before agreeing to use the car again.
Official information and further reading
Requirements can change. Check the linked authority before completing paperwork or relying on a driving entitlement.
General information, not a vehicle inspection or confirmation of stock. Budget examples are planning figures. Current prices and availability must be confirmed.