2018 Subaru WRX AC Isn't Working

Common Causes of AC Malfunctions in Your 2018 Subaru WRX and How to Fix 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 2018 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 are the initial diagnostic steps to take when the AC isn't working in a 2018 Subaru WRX?

When your 2018 Subaru WRX's AC isn't functioning properly, start by checking the thermostat settings to ensure it's set to a cool temperature and that the AC is activated. If the settings are correct, inspect the air filters for dirt or clogs, as these can significantly hinder airflow and cooling efficiency. Next, verify the refrigerant levels using a pressure gauge; low levels often result in warm air blowing from the vents, and recharging the system may be necessary. Pay attention to the AC compressor, listening for any unusual sounds that could indicate a malfunction. Additionally, look for any visible leaks around hose connections and the compressor, as these can lead to refrigerant loss. Finally, check the electrical components associated with the AC system, ensuring all connections are secure and free from corrosion. By systematically following these steps, you can effectively diagnose and potentially resolve the AC issues in your Subaru WRX.

What are the common problems that could cause the AC to stop working in a 2018 Subaru WRX?

When the air conditioning system in a 2018 Subaru WRX fails to cool, it can be frustrating, but understanding the common problems can help you troubleshoot the issue. One of the primary culprits is low refrigerant levels, which can occur due to leaks or insufficient charging, preventing the system from achieving optimal cooling. Another frequent issue is a faulty compressor; if the compressor is not functioning correctly, it will not circulate the refrigerant effectively, leading to inadequate cooling. Additionally, electrical problems such as blown fuses or damaged wiring can disrupt the AC's operation, making it essential to check these components. Clogged or leaking refrigerant lines can also hinder performance, as blockages prevent proper refrigerant flow, while leaks can lead to a loss of refrigerant. Furthermore, a damaged condenser can impede the cooling process, and a malfunctioning thermostat may fail to regulate the system properly. By identifying these common issues, DIYers can take the first steps toward diagnosing and potentially fixing the AC system in their Subaru WRX.

How urgent is it to repair the AC in my 2018 Subaru WRX that isn't working?

When your 2018 Subaru WRX's AC system fails, the urgency of repair cannot be overstated. A malfunctioning AC not only diminishes your comfort during hot weather but can also compromise the air quality inside your vehicle, posing health risks, especially for those with respiratory conditions. Moreover, neglecting this issue can adversely affect your car's resale value, as prospective buyers often look for well-maintained features, including a fully operational AC system. Additionally, continuing to operate a faulty AC can lead to increased strain on other mechanical components, potentially resulting in more severe and costly repairs down the line. Therefore, addressing AC issues promptly is crucial to ensure a comfortable driving experience, safeguard your health, and protect your investment in the vehicle.

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