2019 Subaru WRX STI AC Isn't Working

Common Causes of AC Issues in Your 2019 Subaru WRX STI and How to Resolve Them

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Reviewed by
Bo Fader
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 2019 Subaru WRX STI 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 are the initial steps to diagnose the AC issue in a 2019 Subaru WRX STI?

To effectively diagnose an AC issue in your 2019 Subaru WRX STI, start by checking the air filters, as clean filters are crucial for proper airflow and cooling efficiency. Next, inspect the refrigerant levels; low refrigerant can significantly hinder the system's performance, so ensure they are within the recommended range. Following this, examine the AC compressor for any visible signs of damage or wear, as a malfunctioning compressor can lead to inadequate cooling. Additionally, testing the thermostat is essential to confirm it is regulating the temperature correctly. Finally, conduct a thorough inspection of the AC system for any leaks, as these can result in refrigerant loss and diminished cooling capabilities. By systematically addressing these areas, you can effectively diagnose and potentially resolve AC issues in your Subaru WRX STI.

What are the common causes of AC failure in a 2019 Subaru WRX STI?

When diagnosing AC failure in a 2019 Subaru WRX STI, it's essential to understand the common problems that can arise within the system. One prevalent issue is refrigerant leaks, which can stem from damaged hoses or seals, leading to insufficient cooling. Additionally, electrical problems, such as a malfunctioning compressor clutch or blower motor, can disrupt the AC's operation. The compressor itself is another critical component; if it fails, the system may not produce cold air at all. Clogged or blocked condensers can also impede airflow, resulting in poor cooling performance. Lastly, a faulty thermostat can prevent the system from maintaining the desired temperature, causing inconsistent cooling. By being aware of these potential issues, DIYers can take proactive steps to maintain their vehicle's AC system, ensuring it operates efficiently and effectively. Regular inspections and timely repairs can help mitigate these problems, keeping your Subaru WRX STI comfortable during hot weather.

How urgent is it to repair the AC in my 2019 Subaru WRX STI, considering potential safety risks and further damage?

When it comes to the urgency of repairing the AC in your 2019 Subaru WRX STI, it is crucial to recognize the potential safety risks and the likelihood of further damage if issues are left unaddressed. A malfunctioning AC system can create uncomfortable driving conditions, particularly in extreme temperatures, which can distract you and impair your focus on the road, increasing the risk of accidents. Moreover, a faulty AC can lead to fogging or condensation that obstructs visibility, further compromising your safety. Beyond immediate safety concerns, neglecting AC repairs can result in more severe problems down the line. For instance, a minor leak can escalate into a complete system failure, leading to costly repairs that could have been avoided with timely intervention. Additionally, since the AC system is interconnected with other vehicle components, failing to address issues can trigger a cascade of malfunctions, resulting in even more extensive and expensive repairs. Therefore, it is advisable to prioritize AC repairs to ensure your safety and maintain the overall performance and longevity of your Subaru WRX STI. Regular maintenance and prompt attention to any symptoms can help you avoid significant issues in the future.

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