Engine
Overheating Engine — What to Do and What Causes It
An overheating engine needs immediate attention. Common causes include coolant loss, thermostat failure, radiator blockage, or a faulty water pump.
If the temperature gauge climbs into the red or you see steam from the bonnet, pull over safely and turn off the engine. Let it cool before checking the coolant level. Never open the radiator cap when hot. Common causes of overheating in cars and vans include coolant leaks, a stuck thermostat, a failed water pump, radiator blockages from debris or sludge, and viscous fan coupling failure. Repeated overheating cycles can warp the cylinder head and blow the head gasket, leading to very expensive repairs.
Key takeaways
- Pull over and stop the engine if the gauge enters the red zone
- Check coolant level only after the engine has cooled
- Persistent overheating requires cooling system pressure testing
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