2020 Subaru Forester Heater Isn't Working

Common Causes of Heater Issues in Your 2020 Subaru Forester and How to Resolve Them

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Reviewed by
Bo Fader
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 2020 Subaru Forester 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 circulation in the cabin, affecting the heating system's performance.
  • 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 initial diagnostic steps to take when the heater isn't working in a 2020 Subaru Forester?

When your 2020 Subaru Forester's heater isn't functioning, start by checking the thermostat to ensure it's set correctly and operating as it should, as a malfunction here can significantly affect heating performance. Next, inspect the coolant level in the radiator; low coolant can lead to insufficient heat production, so topping it off may resolve the issue. If the coolant level is adequate, turn your attention to the heater core, looking for any signs of clogs or leaks that could hinder heat transfer. Additionally, assess the blower motor to confirm it's working properly, as a failure here will prevent warm air from circulating inside the cabin. Finally, examine the heater controls to ensure they are functioning correctly, as any issues with these controls can disrupt the entire heating system. By following this structured diagnostic approach, you can effectively identify and address the heating issue in your Subaru Forester.

What are the common problems that could cause the heater to stop working in a 2020 Subaru Forester?

When troubleshooting a heater that has stopped working in a 2020 Subaru Forester, it's essential to consider several common issues that could be at play. First, check the coolant levels, as low coolant can hinder the system's ability to circulate and transfer heat effectively. If the coolant is adequate, the next step is to inspect the thermostat; a malfunctioning thermostat may not regulate temperature properly, leading to heating problems. Additionally, examine the heater core for any clogs or leaks, as these can obstruct the flow of hot air into the cabin. It's also important to assess the blower motor, as a failure here can result in insufficient airflow through the vents. Lastly, don't overlook potential electrical issues, such as blown fuses or wiring problems, which can disrupt the heater's operation. By systematically addressing these common problems, you can effectively diagnose and potentially resolve the heating issue in your Subaru Forester.

How urgent is it to address the non-functioning heater in a 2020 Subaru Forester?

When it comes to a non-functioning heater in your 2020 Subaru Forester, the urgency of addressing this issue cannot be overstated. A reliable heater is not just a luxury; it is essential for maintaining a comfortable cabin temperature, especially during the colder months. Without it, you may find yourself shivering during your drives, which can be a significant distraction and detract from your overall driving experience. Moreover, the heater plays a critical role in defrosting your windshield and windows, ensuring clear visibility in cold or humid conditions. Neglecting this issue can lead to fogged-up windows, which poses a serious safety risk while driving. Additionally, if the underlying cause of the heater malfunction is not addressed promptly, it could lead to more severe mechanical problems down the line, potentially resulting in costly repairs. Lastly, keeping all components of your vehicle in good working order, including the heater, is vital for preserving its resale value. Therefore, it is crucial to prioritize the repair of your heater to ensure a safe, comfortable, and reliable driving experience.

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