Why is my 2010 Subaru Overheating? Causes and Solutions

If you own a 2010 Subaru, you may have noticed that your car occasionally overheats. This issue can be caused by a variety of things, ranging from a malfunctioning thermostat to a damaged radiator. In this article, we’ll explore some of the common causes of overheating and what you can do to solve the problem.

Common Causes of Overheating

Malfunctioning Thermostat

The thermostat regulates the flow of coolant through your car’s engine. If it’s not working correctly, it can get stuck closed, preventing coolant from circulating. This can cause your engine to overheat. Replacing a faulty thermostat is relatively easy and inexpensive.

Coolant Leakage

If your car is losing coolant, it can quickly cause your engine to overheat. This can happen due to a leak in the system or a blown head gasket. Checking for and repairing coolant leaks is essential to avoid further damage.

Damaged Radiator

If your radiator is damaged or clogged, it won’t be able to dissipate heat effectively. This can cause your engine to overheat. Replacing a damaged radiator is necessary to keep your car running smoothly.

Blown Head Gasket

A blown head gasket is a severe issue that can cause your engine to overheat. Symptoms can include oil and coolant mixing or white smoke coming from the exhaust. Unfortunately, a blown head gasket is an expensive and time-consuming repair.

How to Prevent Overheating

Regular maintenance of your Subaru is the key to preventing overheating issues. Make sure you follow the recommended maintenance schedule for your car, including regular coolant flushes and radiator cleanings. Additionally, keep an eye on your car’s temperature gauge and immediately stop driving if it starts to overheat.

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What to Do When Your Car Overheats

If your 2010 Subaru starts to overheat, pull over as soon as it’s safe to do so. Turn off the engine and let it cool down for at least 30 minutes. You can also turn on the heater and blower to help dissipate heat. After 30 minutes, check the coolant level and add more coolant if necessary. If the problem persists, it’s best to take your car to a professional mechanic.

Common Signs of Overheating

It’s essential to recognize the signs of overheating to avoid further damage to your car. Some common signs include:

  • Steam coming from under the hood
  • Temperature gauge in the red zone
  • Strange smells coming from the engine
  • Reduced engine performance
  • Warning lights on the dashboard


In summary, if your 2010 Subaru is overheating, it could be due to a malfunctioning thermostat, coolant leakage, a damaged radiator, or a blown head gasket. Regular maintenance and paying attention to common signs of overheating can help prevent further issues. Don’t ignore overheating problems as they can cause severe damage to your car. Always take your car to a professional mechanic if the issue persists.


Q: Can a dirty air filter cause overheating in a Subaru?
A: No, a dirty air filter can cause reduced engine performance but not overheating.

Q: What is a Subaru head gasket?
A: A head gasket is a seal that sits between the engine block and the cylinder head in Subaru cars. When it fails, oil and coolant can mix, causing the engine to overheat.

Q: How much does it cost to replace a blown head gasket on a 2010 Subaru?
A: The cost to replace a blown head gasket on a 2010 Subaru can range from $1,500 to $3,000.

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Billy Covington

With a passion for all things automotive, Billy is our go-to expert on Subaru performance upgrades and modifications. He's been featured in several car magazines and blogs, and his extensive knowledge and expertise make him a valuable member of our team. When he's not working on cars, he enjoys playing guitar and writing music.

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