2008 Subaru Impreza Ac Isn't Working

Common Causes of AC Failure in Your 2008 Subaru Impreza 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 2008 Subaru Impreza 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 2008 Subaru Impreza?

When your 2008 Subaru Impreza's air conditioning system fails to cool, start by checking the condenser fan to ensure it operates immediately upon activating the AC. If the fan is unresponsive, investigate potential causes such as a faulty fan, relay, or wiring issues. Next, inspect the fuses and relays associated with the AC system; replacing any blown fuses and swapping relays can help identify electrical faults. It's also essential to assess the refrigerant level, as low levels can lead to compressor disengagement. If necessary, add refrigerant carefully to avoid overcharging. Additionally, verify the air gap of the AC compressor clutch, which should be within the specified range for optimal performance. Don't overlook the condition of o-rings and seals, as leaks here are common culprits. A clogged cabin air filter can also hinder cooling efficiency, so check and replace it if needed. Ensure the blend door actuator is functioning properly to maintain temperature control, and inspect the condenser for blockages or damage that could impede refrigerant flow. Lastly, examine the electrical system for any wiring issues and utilize the diagnostic test mode to cycle relays and assess the AC system's electronics. By following these steps, you can effectively diagnose and address common AC problems in your Subaru, paving the way for a cooler ride.

What are the common problems that could cause the AC to stop working in a 2008 Subaru Impreza?

When troubleshooting the air conditioning system in a 2008 Subaru Impreza, it's essential to understand the common problems that could lead to a malfunction. One prevalent issue is refrigerant leaks, often occurring around the O-rings of the AC compressor, which can deteriorate over time and allow refrigerant to escape, resulting in inadequate cooling. Another critical component is the AC compressor itself; if it fails or operates inefficiently, the refrigerant won't circulate properly, leading to warm air blowing from the vents. Additionally, the condenser plays a vital role in cooling the refrigerant, and any blockages or damage can hinder its function, affecting the overall performance of the AC system. Electrical issues, such as faulty relays or blown fuses, can also disrupt the AC's operation, making it necessary to inspect these components for any signs of failure. Furthermore, the air gap between the AC compressor clutch and the electromagnet may widen over time, preventing proper engagement, while a clogged cabin air filter can restrict airflow, putting extra strain on the system. Lastly, a defective blend door actuator can interfere with temperature regulation, impacting the comfort level inside the vehicle. By systematically checking these areas, DIY enthusiasts can often pinpoint the cause of AC issues and determine whether a simple fix is possible or if professional help is needed.

How urgent is it to address the non-functioning AC in a 2008 Subaru Impreza?

When dealing with a non-functioning air conditioning system in a 2008 Subaru Impreza, it is essential to recognize the urgency of the situation. The discomfort caused by high temperatures can significantly affect the driving experience, especially during the sweltering summer months. This discomfort can escalate into health risks for vulnerable passengers, making it crucial to prioritize repairs. Additionally, neglecting the issue may lead to more severe complications, such as refrigerant leaks or compressor failures, which can result in costly repairs down the line. Regular maintenance is key to preventing these problems; therefore, if you notice symptoms like blown fuses or water accumulation, it is imperative to act quickly. Addressing these issues not only ensures a comfortable ride but also protects the overall health of your vehicle's AC system. If you feel uncertain about diagnosing the problem, seeking assistance from a qualified mechanic is advisable to avoid further complications.

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