2017 Subaru Legacy Is Overheating

Common Causes of Overheating in Your 2017 Subaru Legacy and How to Resolve Them

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 2017 Subaru Legacy 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.

What are the initial diagnostic steps to take for a 2017 Subaru Legacy that is overheating?

When faced with an overheating 2017 Subaru Legacy, it's essential to adopt a systematic diagnostic approach to identify the root cause effectively. Start by checking the coolant level in both the radiator and the reservoir, as low coolant can lead to overheating. If the coolant is adequate, inspect the cooling system for any visible leaks, particularly around hoses, the radiator, and the water pump, since leaks can significantly reduce coolant levels. Next, examine the radiator cap for any signs of wear or damage, as a faulty cap can disrupt the system's pressure and contribute to overheating. Ensure that the cooling fans are operational, as they play a crucial role in maintaining airflow through the radiator. Following this, test the thermostat to confirm it is functioning correctly; a malfunctioning thermostat can prevent proper coolant circulation. Additionally, inspect the water pump for leaks or signs of failure, as it is vital for circulating coolant throughout the engine. Finally, check the radiator for blockages or damage that could impede coolant flow. By methodically following these steps, you can effectively diagnose and address the overheating issue in your Subaru Legacy, ensuring a smoother and safer driving experience.

What are the common causes of overheating in a 2017 Subaru Legacy?

When diagnosing overheating issues in a 2017 Subaru Legacy, it's essential to consider several common problems that could be at play. One of the primary culprits is low coolant levels, which can occur due to evaporation or leaks, preventing the engine from receiving adequate cooling. Additionally, cooling system leaks, whether from the radiator, hoses, or connections, can lead to a significant loss of coolant, exacerbating the overheating problem. Another critical component to check is the thermostat; if it fails to open or close properly, it can disrupt the flow of coolant, causing the engine to overheat. Furthermore, issues with the cooling fan, such as a malfunctioning motor or relay, can impede airflow through the radiator, which is vital for maintaining optimal engine temperatures. Lastly, a clogged radiator can restrict coolant flow, making it difficult for the system to dissipate heat effectively. By understanding these common causes, DIYers can take proactive steps to troubleshoot and address overheating issues, ensuring their Subaru Legacy runs smoothly and efficiently. Regular maintenance and timely inspections are key to preventing these problems from escalating.

What immediate steps should be taken to address the overheating issue in a 2017 Subaru Legacy?

When your 2017 Subaru Legacy begins to overheat, it’s crucial to act swiftly to prevent severe engine damage and ensure your safety on the road. Ignoring the signs of overheating can lead to catastrophic failures, such as a blown head gasket or engine seizure, which can be costly to repair. Start by turning off the engine immediately to halt any further damage. Allow the engine to cool down completely before proceeding, as attempting to open the hood while it’s still hot can be dangerous. Once it’s safe, check the coolant levels in both the radiator and reservoir; low coolant can be a primary cause of overheating. If you find any leaks in the cooling system, address them right away, as they can exacerbate the problem. Inspect the radiator for blockages or damage, and ensure that the thermostat and water pump are functioning correctly, as these components are vital for maintaining optimal engine temperature. Lastly, verify that the cooling fans are operational, as they play a critical role in regulating heat. If these DIY steps do not resolve the issue, it’s imperative to consult a qualified mechanic to prevent further complications. Taking these immediate actions not only safeguards your vehicle but also enhances your safety on the road.

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.

2017 Subaru Legacy Overheating: Causes & Repair Costs