Why is my car overheating?
An overheated car can be a stressful experience and you may be unsure of what to do should the situation arise. It is essential to act quickly if your car is overheating to avoid further damage to your car engine and keep yourself safe. Keep reading to discover why a car overheats and what to do if it happens.
Car overheating causes
There are numerous reasons why your car might overheat such as:
- An issue with your car’s cooling system.
- A faulty cooling fan.
- A faulty coolant pump.
- A blocked radiator inlet.
- Faulty head gasket.
What should I do if my car is overheating?
If your car is overheating, you may experience several of these things:
- Temperature gauge readings are higher than normal and/or a warning light may appear on your dashboard.
- Steam coming from your car bonnet.
- Clicking or clanking noises.
- Leaking engine coolant.
- A burning smell coming from the engine.
- Poor engine performance
What you should do if you notice these issues;
Pullover
If any of these signs occur, pull over to a safe place, turn off your engine and ensure you and all passengers vacate the vehicle and are away from the road.
Leave the engine to cool
If you can, open the bonnet but be wary that steam may be released and will be extremely hot. Try and leave the engine to cool for at least half an hour.
Check the coolant tank
Under no circumstances should you remove the radiator or expansion tank cap if your car has overheated as this can lead to steam burns. If you can open the cap once the engine has cooled down, make sure you open it slowly. You can then check the coolant tank once the engine has cooled. If the tank is empty, check for signs of a possible leak such as a puddle.
Based on what you see, there are two options for what to do next:
Top up your coolant - You may need to top up the tank with coolant – try not to use straight water, particularly cold water, as this can damage the engine. If it’s an emergency, you can top up with water to help you drive to the closest garage but keep a close eye on your temperature gauge or warning lamp.
Visit a garage - If the coolant level is full, then there’s likely to be a more serious underlying issue with the engine. If this is the case, you’ll need to speak to a garage or call your breakdown service as soon as possible.
How to check engine coolant?
If you need to check or manually top up your engine coolant, follow these steps:
- Locate your expansion tank. If you’re unsure, check your vehicle handbook.
- Check the coolant level – this should be between the minimum and maximum marks.
- Check hoses – wet or any colour-stained hoses could indicate further issues.
- If you need to top up, do so when the engine is cool.
- If the coolant level has suddenly dropped, get this checked by a garage.
What is engine coolant?
Engine coolant usually consists of anti-freeze and water. It can prevent your car engine from freezing when it’s cold while also preventing it from overheating. There are different types of anti-freeze, so it’s essential that you use the right kind for your vehicle. For more advice, check out our article on which antifreeze is right for me?
What if my temperature warning light comes on?
The temperature warning light on your dashboard looks like a little thermometer. If this comes on, it usually means that your engine coolant levels are low and or that your engine is overheating. Leave the engine to cool down for 30 minutes and top up your coolant if necessary. If the temperature warning light is still on, you’ll need to take it to a garage as soon as possible as this signifies a more serious issue with the cooling system.
How long does it take for a car to cool down?
It’s recommended that you leave your car for at least 30 minutes to cool down but preferably an hour, if possible, to allow it to cool down fully.
How to prevent a car from overheating?
If you’re concerned about your car overheating, there are a variety of steps you can take to reduce the likelihood of this happening.
- Regularly check your temperature gauge and coolant levels.
- Keep coolant in your vehicle to allow you to top up if necessary.
- Have your coolant replaced in accordance with the manufacturer's recommendations.
What happens to the engine if a car overheats?
If your car does overheat, it may not impact the engine too much, providing that the issue is addressed quickly, and you speak to a garage if necessary.
However, failing to address issues with your cooling system could result in further damage and could cost a substantial amount to repair further down the line.
Can I drive if my car is overheating?
You should never continue driving if your car is overheating as this could place further strain on the engine, which is not only unsafe but can also be incredibly costly to fix. You should pull over to a safe place as soon as possible if your car does overheat.
If you’re concerned about your car engine, head to your local Halfords Autocentre to get it checked out. If any repairs are necessary, we’ll provide you with a no-obligation quote before carrying out any work.
We also stock thousands of car parts online with free next-working-day delivery available.