2016 Subaru WRX STI AC Isn't Working

Common Causes of AC Malfunctions in Your 2016 Subaru WRX STI and How to Fix 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 2016 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 short circuit in the wiring can disrupt the electrical signals needed for proper operation of 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 2016 Subaru WRX STI?

When diagnosing the AC issue in a 2016 Subaru WRX STI, it's essential to adopt a systematic approach that begins with the most straightforward checks. Start by inspecting for any refrigerant leaks, as these can significantly hinder the system's cooling performance. Next, examine the AC compressor to ensure it is operating correctly; a malfunctioning compressor may require replacement. It's also crucial to assess the AC condenser for dirt or clogs, which can obstruct airflow and reduce efficiency. Pay special attention to the o-rings on the compressor, as leaks here are common and can prevent the compressor from engaging properly. If these initial checks do not reveal the problem, consider performing a leak test at a specialized shop, where technicians can use dye to identify hidden leaks. Lastly, be cautious about dealer repairs for air gap issues, as they may recommend unnecessary compressor replacements. By following this structured diagnostic approach, you can effectively pinpoint the AC issue and determine the best course of action for repairs.

What are the common causes for the AC not working in a 2016 Subaru WRX STI?

When troubleshooting the air conditioning system in a 2016 Subaru WRX STI, it's essential to understand the common problems that could be affecting its performance. One prevalent issue is a refrigerant leak, which can lead to a gradual loss of refrigerant, ultimately resulting in the AC blowing warm air. Additionally, electrical climate control issues may disrupt the system's functionality, preventing it from cooling effectively. A malfunctioning air conditioning compressor is another critical factor to consider, as it plays a vital role in the cooling process. It's also important to check the refrigerant levels; both low and overcharged refrigerant can hinder the AC's performance. Other potential culprits include a clogged cabin air filter, which restricts airflow, and dirty condenser or evaporator coils that can impede the cooling process. Furthermore, a sluggish blower motor can affect airflow, while bad fuses or relays may interrupt the electrical supply to the AC system. By systematically investigating these common causes, DIY enthusiasts can effectively diagnose and address the AC issues in their Subaru WRX STI.

How urgent is it to repair the non-functioning AC in a 2016 Subaru WRX STI?

When considering the urgency of repairing a non-functioning AC in your 2016 Subaru WRX STI, it's essential to recognize that while immediate safety may not be compromised, the discomfort and distractions caused by inadequate climate control can significantly impact your driving experience. In extreme weather conditions, a malfunctioning AC can lead to an uncomfortable cabin environment, making it difficult to focus on the road. Additionally, a faulty AC system can affect the overall ventilation, resulting in poor airflow and compromised heating capabilities, which can be particularly problematic during colder months. Ignoring these symptoms can lead to further strain on the AC system, potentially resulting in more severe damage and costly repairs down the line. Therefore, it is advisable to have the AC system inspected by a qualified technician who can diagnose any underlying issues, such as leaks or component failures, ensuring that your vehicle remains comfortable and functional for the long haul. Addressing the AC problem promptly not only enhances your driving comfort but also helps maintain the integrity of your vehicle's overall climate control system.

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