2021 Subaru Forester AC Isn't Working

Common Causes of AC Issues in Your 2021 Subaru Forester and How to Fix Them

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Reviewed by

Devin Cabugcal

Written by RepairPal Car Genius

Updated January 14, 2025

37% chance it's the

Refrigerant Leak

21% chance it's the

Climate Control Electrical Issue

12% chance it's the

AC Compressor

30% chance it's

Something else

The most common reasons a 2021 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.

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RepairPal Certified shops can diagnose and repair your 2021 Subaru Forester climate control issues. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

What are the initial steps to diagnose the AC issue in a 2021 Subaru Forester?

When diagnosing an AC issue in a 2021 Subaru Forester, it's essential to adopt a systematic diagnostic approach that begins with the simplest checks. Start by inspecting the air filters, as clean filters are crucial for optimal airflow; clogged filters can significantly hinder AC performance. Next, verify the refrigerant levels in the system, as insufficient refrigerant can lead to inadequate cooling. If the refrigerant levels are correct, examine the AC compressor for any visible damage or leaks, as these can directly affect the system's functionality. Additionally, testing the thermostat is vital to ensure it accurately regulates the vehicle's interior temperature. Finally, conduct a thorough inspection for any leaks in the AC system, as these can result in refrigerant loss and diminished cooling efficiency. By following these steps, you can effectively diagnose the AC issue and determine the necessary repairs for your Subaru Forester.

What are the common problems that could cause the AC to stop working in a 2021 Subaru Forester?

When troubleshooting the air conditioning system in a 2021 Subaru Forester, it's essential to understand the common problems that may lead to a malfunction. One of the primary issues is low refrigerant levels, which can significantly hinder the system's ability to cool the air effectively. If the refrigerant is low, it may indicate a leak or that the system has not been properly charged. Another potential culprit is a faulty compressor; if the compressor is not functioning correctly, it will fail to circulate refrigerant, resulting in warm air blowing from the vents. Additionally, electrical issues such as blown fuses or damaged wiring can disrupt the AC's operation, preventing it from turning on or functioning properly. A clogged or leaking condenser can also impede the cooling process, as it is responsible for dissipating heat from the refrigerant. Lastly, broken cooling fans can prevent adequate airflow through the condenser, further exacerbating cooling issues. By identifying and addressing these common problems, DIY enthusiasts can effectively diagnose and potentially resolve AC issues in their Subaru Forester.

How urgent is it to address the AC failure in my 2021 Subaru Forester?

When faced with an AC failure in your 2021 Subaru Forester, it is crucial to recognize the urgency of the situation. A malfunctioning air conditioning system not only compromises your comfort during hot weather but can also pose safety risks by distracting you from the road. The discomfort caused by excessive heat can lead to decreased focus, making it essential to address the issue promptly. Moreover, neglecting AC problems can result in more severe damage to the system, leading to costly repairs that could have been avoided with timely intervention. Additionally, maintaining a fully functional AC system is vital for preserving your vehicle's resale value; potential buyers often consider the condition of the AC when evaluating a used car. Therefore, addressing AC failures swiftly is not just about immediate comfort but also about ensuring safety, preventing further damage, and maintaining the overall value of your Subaru Forester.

Related 2021 Subaru Forester Problems

Read about related problems experienced by other Subaru Forester drivers like you.

Subaru Forester air conditioning issue after condenser replacement

Some Subaru Forester owners report experiencing air conditioning issues after a condenser replacement, particularly with the compressor clutch appearing to remain engaged continuously, which may be normal for post-2019 models. Additionally, they emphasize the importance of verifying correct refrigerant levels, as high side pressure of 200 PSI and low side pressure of 40 PSI indicate a functioning system. Common causes of AC problems noted by owners include low or overcharged refrigerant, compressor malfunctions, clogged cabin air filters, and dirty condenser or evaporator coils. Electrical issues, such as switch failures, blown fuses, or harness damage at the AC compressor, can also disrupt functionality. Furthermore, a dirty pollen filter may reduce cooling efficiency and strain the AC system, highlighting the necessity of regular cabin filter changes for optimal performance. To resolve these issues, it is recommended that owners check these components to ensure the AC system operates correctly.

2 model years affected

Avg Mileage: 119,000

3 others reported problem

1 comment

Subaru Forester bad AC clutch issue not yet resolved

Some Subaru Forester owners report experiencing issues with the AC clutch, including problems related to low refrigerant levels, which may require recharging. Others have noted that a faulty AC compressor clutch relay can lead to malfunctioning, necessitating inspection and replacement. Additionally, some owners find that the AC clutch coil or air gap issues prevent the clutch from engaging, despite receiving power. Many emphasize the importance of routine maintenance, as the AC clutch gap is crucial for the compressor's proper operation and overall cooling performance. Repair costs for a failing AC compressor clutch can range from $500 to $1000, and some owners suggest considering independent shops for potentially more affordable solutions. Commonly reported issues also include o-ring problems on the compressor, which can cause refrigerant leaks and engagement difficulties. If the AC clutch produces a whining noise after engine cleaning, it may indicate a need for further attention. In cases where problems persist, owners are advised to seek further diagnosis from a qualified mechanic to identify and resolve the underlying issues.

1 model year affected

Avg Mileage: 179,000

2 others reported problem

1 comment

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