2021 Subaru WRX AC Isn't Working

Common Causes of AC Issues in Your 2021 Subaru WRX and How to Resolve Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
37% chance it's the
Refrigerant Leak
0%
21% chance it's the
Climate Control Electrical Issue
0%
12% chance it's the
AC Compressor
0%
30% chance it's
Something else
The most common reasons a 2021 Subaru WRX AC isn't working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.
  • Refrigerant Leak: A refrigerant leak can occur due to damaged hoses, seals, or connections, resulting in decreased cooling efficiency in the air conditioning system.
  • Climate Control Electrical Issue: A faulty climate control module or a blown fuse could be causing the electrical issues in the climate control system.
  • AC Compressor: A faulty AC compressor may be due to a lack of lubrication, electrical issues, or internal mechanical failure, resulting in inadequate cooling performance.
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 steps should I take to diagnose the AC issue in my 2021 Subaru WRX?

When diagnosing the AC issue in your 2021 Subaru WRX, it's essential to adopt a systematic approach that begins with the simplest checks before progressing to more complex diagnostics. Start by inspecting the air filters, as dirty or clogged filters can significantly restrict airflow and diminish AC performance. Next, assess the refrigerant levels; low refrigerant can lead to inadequate cooling, and while you may need a professional for a refill, checking the levels is a straightforward task. Following this, examine the compressor, which is vital for the AC's operation; any issues here can severely impact cooling efficiency. Additionally, look for visible leaks in the AC system, as these can result in refrigerant loss and further cooling problems. Testing the thermostat is also crucial, as a malfunctioning thermostat can disrupt the AC's functionality. Don’t overlook the electrical components, such as relays and switches, which can also cause AC issues if faulty. Finally, inspect the AC condenser, as any damage to this component can hinder the cooling process. By methodically following these steps, you can effectively diagnose and address the AC problems in your Subaru WRX, ensuring a comfortable driving experience.

What are the common problems that could cause the AC to stop working in a 2021 Subaru WRX?

When the air conditioning system in a 2021 Subaru WRX ceases to function, several common issues may be at play. One of the primary culprits is low refrigerant levels, which can significantly hinder the system's ability to cool the air. If the refrigerant is low, it may indicate a leak somewhere in the system that needs to be addressed. Another frequent issue is a faulty compressor; if the compressor is not operating correctly, it will fail to circulate refrigerant, resulting in warm air blowing from the vents. Additionally, electrical problems, such as blown fuses or damaged wiring, can disrupt the AC's operation, preventing it from turning on or functioning properly. Clogged or leaking condensers can also impede the cooling process, as they are essential for dissipating heat from the refrigerant. Lastly, broken cooling fans can lead to insufficient airflow, further compromising the system's efficiency. By understanding these common problems, DIYers can better diagnose the issue and determine whether they can tackle the repairs themselves or if professional assistance is needed.

How urgent is it to address the AC failure in my 2021 Subaru WRX?

When it comes to the AC failure in your 2021 Subaru WRX, the urgency of addressing the issue cannot be overstated. A functioning air conditioning system is essential for maintaining a comfortable driving environment, particularly during sweltering summer months or on long road trips. Without it, you may find yourself struggling with discomfort, which can detract from your overall driving experience. Moreover, the safety implications of a malfunctioning AC system are significant; extreme heat can impair your focus and alertness, increasing the risk of accidents. By tackling AC issues promptly, you not only enhance your comfort and safety but also engage in preventive maintenance that can save you from more extensive and costly repairs in the future. Additionally, keeping your vehicle's AC system in good working order can positively influence its resale value, making it a more attractive option for potential buyers. Therefore, while it may not seem like an immediate emergency, addressing AC failure in your Subaru WRX should be a priority to ensure a safe, comfortable, and valuable driving experience.

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2021 Subaru WRX AC Not Working: Common Issues & Repairs