Subaru Outback Is Overheating

Common Causes of Overheating in Your Subaru Outback and How to Prevent Engine Damage

Find Repair Location
Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
24% chance it's the
Thermostat
0%
41% chance it's the
Coolant leak (water pump, radiator, hose etc.)
0%
32% chance it's the
Radiator Fan
0%
3% chance it's
Something else
The most common reasons a Subaru Outback is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat.
  • Thermostat: A faulty thermostat can cause the engine to overheat or run too cool by failing to regulate the flow of coolant properly.
  • Coolant leak (water pump, radiator, hose etc.): A coolant leak can occur due to a damaged hose, a failing water pump, or a compromised radiator, leading to loss of coolant and potential engine overheating.
  • Radiator Fan: A faulty radiator fan can lead to engine overheating due to insufficient airflow over the radiator.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

Troubleshooting Overheating Issues in a Subaru Outback

When faced with overheating issues in your Subaru Outback, it's essential to adopt a systematic diagnostic approach. Begin by checking the water pump, as it plays a crucial role in circulating coolant throughout the engine. If the water pump is functioning properly, the next step is to inspect the thermostat, which regulates coolant flow; using genuine Subaru or Mahle parts is advisable to avoid complications. Ensure that the cooling system is adequately burped to eliminate any trapped air, as this can often resolve minor overheating issues. If the engine has overheated, allow it to cool completely before proceeding with any repairs. Flushing the heater core can also help, as it ensures that coolant is flowing correctly. Throughout this process, keep a close eye on the temperature gauge; if it remains high after idling, it may be time to seek professional assistance. By following this methodical approach, you can effectively diagnose and address overheating problems, safeguarding your vehicle from potential damage.

What to Check When Your Subaru Outback is Overheating?

When your Subaru Outback is overheating, it's crucial to identify and address common problems that may be contributing to the issue. Begin by checking the coolant level in the reservoir, as a low level can lead to overheating; make it a habit to inspect this every couple of weeks. If you spot any coolant leaks, this could signal a more serious underlying issue that needs immediate attention. Next, assess the functionality of the cooling fans located behind the radiator; these fans are essential for regulating engine temperature, particularly at lower speeds. If they fail to operate, it can result in significant overheating. Additionally, ensure that the radiator fins are clean and unobstructed by debris, as any blockage can severely hinder airflow and cooling efficiency. The water pump is another vital component to examine; it must be functioning properly to maintain adequate coolant circulation throughout the system. Don't overlook the thermostat, as a faulty one can disrupt the coolant flow and exacerbate overheating issues. Lastly, if your Outback is running hot, consider turning off the air conditioning and switching on the heater to help draw heat away from the engine. By systematically checking these common problems, you can effectively troubleshoot and resolve overheating issues, ensuring your Subaru Outback operates smoothly and efficiently.

Why is My Subaru Outback Overheating and What Should I Do?

When your Subaru Outback begins to overheat, it’s crucial to act swiftly to prevent severe damage to your vehicle. Overheating can lead to catastrophic failures, such as a blown head gasket or engine seizure, which can be costly to repair. Ignoring the signs, such as a rising temperature gauge or steam emanating from under the hood, can escalate the problem, potentially leaving you stranded or facing extensive repairs. If you notice your engine temperature climbing, immediately turn off the air conditioning and switch on the heater to help dissipate heat. This temporary measure can provide some relief while you find a safe place to pull over. Always prioritize safety; if warning lights activate or steam is visible, stop the vehicle and avoid turning off the engine to minimize damage. Addressing these overheating symptoms promptly not only safeguards your Subaru but also ensures your safety on the road. If the issue persists despite your efforts, consulting a professional mechanic is essential to diagnose and resolve any underlying problems effectively.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

Subaru Outback Overheating: Causes, Symptoms & Repair Costs