2010 Subaru Impreza Heater Isn't Working

Common Causes of Heater Issues in Your 2010 Subaru Impreza and How to Resolve Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
31% chance it's the
Heater Blower Motor
0%
18% chance it's the
Heater Blower Motor Resistor
0%
51% chance it's
Something else
The most common reasons a 2010 Subaru Impreza heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
  • Heater Blower Motor: A faulty heater blower motor can result in inadequate airflow or no air coming from the vents, often due to electrical issues or motor failure.
  • Heater Blower Motor Resistor: A faulty heater blower motor resistor can cause inconsistent fan speeds or complete failure of the blower motor.
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 steps to diagnose why the heater isn't working in a 2010 Subaru Impreza?

To effectively diagnose why the heater isn't working in your 2010 Subaru Impreza, start by reporting the specific symptoms you are experiencing. This initial information is crucial as it guides the diagnostic process. Next, consider the complexity of the heating system, which relies on multiple components including the electric fan, heater core, and engine coolant. Begin your assessment by checking the coolant level; low coolant or air trapped in the system can significantly hinder heater performance. If the coolant is adequate, inspect the blower fan to ensure it is operational, as it plays a vital role in circulating warm air into the cabin. Additionally, be aware of potential water intrusion issues that could affect the blower motor, leading to rust and malfunction. By systematically evaluating these elements, you can pinpoint the cause of the heater's failure and take appropriate action to restore warmth to your vehicle.

What are the common problems that could cause the heater to stop working in a 2010 Subaru Impreza?

When diagnosing why the heater in a 2010 Subaru Impreza has stopped working, it's essential to consider several common problems that could be at play. One of the first things to check is the coolant level; low coolant or air trapped in the cooling system can significantly hinder heater performance. Additionally, a malfunctioning thermostat can prevent the engine from reaching the optimal temperature, which is crucial for effective heating. Another potential issue is a faulty heater core, which can lead to inadequate heat transfer. It's also important to inspect for air pockets or an airlocked cooling system, as these can disrupt the flow of coolant and impair the heater's functionality. Lastly, ensure that the entire heating system is properly filled and bled, as an inefficient water pump due to these issues can further compromise heating performance. By systematically addressing these factors, you can effectively troubleshoot and resolve the heating issues in your Subaru Impreza.

How urgent is it to address the non-functioning heater in my 2010 Subaru Impreza?

Addressing a non-functioning heater in your 2010 Subaru Impreza is crucial for maintaining both comfort and safety during colder months. Ignoring this issue can lead to more severe problems, such as overheating or engine damage, which can result in costly repairs. A malfunctioning heater may stem from various causes, including electrical failures, mechanical issues, or coolant leaks, all of which require prompt attention. For DIY enthusiasts, diagnosing the problem early can save time and money; for instance, checking the heater core for leaks or ensuring the heater fan is operational can often be done without professional help. Additionally, Subaru customer support may provide guidance on temporary fixes or replacement parts, making it easier to tackle the issue yourself. By addressing the heater problem promptly, you not only enhance your driving experience but also prevent further complications that could compromise your vehicle's performance and safety.

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