2018 Subaru Outback AC Isn't Working

Common Causes of AC Failure in Your 2018 Subaru Outback and How to Restore Comfort

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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 Outback 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 Outback?

When your 2018 Subaru Outback's AC isn't functioning properly, start by checking the thermostat settings to ensure they are correctly adjusted. Sometimes, the simplest solution is just a matter of setting the desired temperature. Next, inspect the air filters; dirty or clogged filters can significantly hinder airflow, so replacing them can often restore AC performance. If the issue persists, examine the refrigerant levels using a pressure gauge, as low levels can lead to warm air blowing from the vents. Additionally, look for any signs of leaks in the AC system, such as oily residue around hoses or connections, which can indicate a refrigerant loss. It's also crucial to test the compressor to ensure it engages when the AC is activated; a malfunctioning compressor may require repair or replacement. Finally, check the electrical connections related to the AC system for any signs of corrosion or looseness, as faulty connections can disrupt the system's operation. By following these steps, you can systematically diagnose and address common AC issues in your Subaru Outback, potentially saving time and money on repairs.

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

When your 2018 Subaru Outback's AC system fails to cool, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the primary culprits is low refrigerant levels, which can occur due to leaks or insufficient charging, leading to inadequate cooling. Another frequent issue is a faulty compressor; if the compressor isn't functioning properly, it won't circulate refrigerant effectively, resulting in a lack of cool air. Additionally, electrical problems such as blown fuses or damaged wiring can disrupt the AC's operation, making it essential to check these components. A clogged or leaking condenser can also hinder the system's performance, as it plays a crucial role in dissipating heat. Lastly, ensure that the cooling fans are operational, as malfunctioning fans can prevent the AC from working efficiently. By systematically checking these areas, you can identify and potentially resolve the AC issues in your Subaru Outback, making it a manageable DIY project.

How urgent is it to address the AC failure in my 2018 Subaru Outback?

When faced with an AC failure in your 2018 Subaru Outback, it is essential to recognize the urgency of the situation. A functioning air conditioning system is not just a luxury; it plays a vital role in maintaining a comfortable driving environment, especially during sweltering summer months or on long journeys. The discomfort caused by a malfunctioning AC can distract you from the road, potentially compromising your safety. Moreover, neglecting AC issues can lead to more severe problems, resulting in costly repairs that could have been avoided with timely intervention. Additionally, keeping your vehicle's AC system in good working order is beneficial for its resale value; prospective buyers are often drawn to well-maintained vehicles. Therefore, while it may not seem like an immediate emergency, addressing AC failures promptly is crucial for your comfort, safety, and the long-term health of your Subaru Outback.

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