WhoCanFixMyCar explains the most common reasons for why your car is overheating
This could indicate a number of things have gone wrong, from minor fixes to issues that require a trained mechanic. Let's explore the reasons why you may be seeing steam coming from under your bonnet...
A possible cause for the steam under your bonnet when driving is a coolant leak. Have this seen to and fixed by a leak specialist to prevent any further damage.
If your car doesn't have enough coolant circulating through the engine, this can cause it to overheat. To deal with an overheating engine:
Make sure the AC is turned off.
Turn the heater on as it will blow excess heat from the engine into the car.
Put the car in neutral and rev the engine.
Pull over, wait 15 minutes for the engine to cool down, then open the car's bonnet. This will help you to identify the source of the problem.
Coolant levels sometimes decrease over time, but it's likely that low coolant indicates a leak. You should get your car checked by a professional to prevent serious damage.