2012 Subaru Forester Ac Isn't Working

Common Causes of AC Failure in Your 2012 Subaru Forester and How to Restore Comfort

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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 2012 Subaru Forester 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 2012 Subaru Forester?

When your 2012 Subaru Forester's air conditioning system fails to operate, it's essential to adopt a systematic diagnostic approach to identify the underlying issue. Begin by checking the fuses and relays associated with the AC system, as a blown fuse can often be the simplest explanation for a malfunction. If the fuses are intact, inspect the cabin air filter; a clogged filter can restrict airflow and hinder cooling performance. Next, verify the electrical connections to the AC compressor, ensuring that all contacts are secure and that the control module is receiving adequate power. It's also crucial to assess the compressor clutch air gap, as an improper gap can prevent the compressor from engaging. If these initial checks do not resolve the issue, examine the refrigerant levels using a gauge; low levels may indicate a leak that requires further investigation. Additionally, ensure that the AC compressor and condenser are functioning correctly, as blockages or mechanical failures can impede performance. For a more thorough diagnosis, consider utilizing diagnostic tools to test the power supply to the compressor and engage the self-diagnosis mode of the vehicle to evaluate the operation of various components. By following this structured approach, you can effectively narrow down the potential causes of the AC malfunction and determine whether a simple fix or professional assistance is needed.

What are the common causes of AC failure in a 2012 Subaru Forester?

When dealing with AC failure in a 2012 Subaru Forester, it's essential to understand the common problems that may arise. One prevalent issue is the AC compressor clutch, which can fail to engage due to an excessive gap between the clutch and compressor. This can often be remedied by adjusting the gap with feeler gauges. Another frequent culprit is refrigerant leaks, particularly at the O-rings on the AC compressor lines, which can dry out and shrink over time, leading to system malfunctions. Additionally, a defective blend door actuator can disrupt airflow and temperature control, so it's important to listen for unusual sounds when adjusting settings. Problems with the expansion valve can also occur, as it may become stuck, affecting the pressure balance within the system. Furthermore, a blocked or defective condenser can hinder the refrigerant's ability to release heat, potentially causing engine overheating. Electrical issues, such as a faulty AC relay or pressure switch, can lead to intermittent operation, necessitating a thorough check of the electrical system. Lastly, neglecting the cabin air filter can reduce AC efficiency, so regular maintenance is crucial. By addressing these common issues, DIYers can often restore their Forester's AC functionality effectively.

How urgent is it to repair the non-functioning AC in a 2012 Subaru Forester?

When it comes to repairing a non-functioning AC in a 2012 Subaru Forester, understanding the urgency of the situation is crucial for any DIY enthusiast. The immediate comfort and safety of the vehicle's occupants should be a primary concern, especially in regions experiencing high temperatures. A malfunctioning AC can lead to discomfort and even health risks for vulnerable individuals, making timely repairs essential. Additionally, neglecting AC issues can result in further damage to the system. For instance, a refrigerant leak or a failing compressor can exacerbate problems, leading to more complex and costly repairs down the line. It's also important to consider the integrity of the AC system; continued use in the presence of leaks can cause moisture accumulation, ice formation, and damage to critical components like the evaporator and condenser. Furthermore, electrical issues, such as a blown fuse or faulty AC clutch coil, may indicate deeper problems that require immediate attention to prevent further damage. While the vehicle may still operate without immediate safety risks, addressing AC issues promptly is vital to maintain comfort, prevent extensive damage, and avoid higher repair costs in the future. Therefore, if you're considering a DIY repair, it's advisable to inspect the AC system as soon as possible to ensure it functions efficiently and safely.

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