2016 Subaru Forester A/C Refrigerant and Oil Guide

Quick answer

• Refrigerant Type: R-1234yf
• Full System Charge: 17.6 oz (500g)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 3.4-4.1 oz (100-120 mL)
• Low-Side Service Port Location: Near the firewall, on the passenger side
• High-Side Service Port Location: In front of the radiator, near the hood latch

Why R-1234yf matters

Starting in 2014, Subaru and other automakers began transitioning to R-1234yf refrigerant. This new standard has a much lower global warming potential (GWP) than its predecessor, R-134a. While this is great for the environment, it does have some implications for service:

• Cost: R-1234yf is significantly more expensive than R-134a.
• Specialized Equipment: Servicing R-1234yf systems requires a dedicated recovery and charging machine. Cross-contamination with R-134a can cause system damage.
• Mild Flammability: R-1234yf is mildly flammable, which means extra care must be taken during service.

Recharge procedure

A proper A/C recharge is not a simple top-off. To ensure optimal performance and longevity, the system must be fully evacuated before being recharged. This removes any air or moisture that may have entered the system, which can cause damage and reduce cooling performance. The system should then be recharged with the precise weight of refrigerant specified by the manufacturer—in this case, 17.6 oz (500g). Do not use pressure gauges to determine the correct charge, as this can be inaccurate and lead to overcharging or undercharging.

Common A/C problems for this vehicle

While the 2016 Forester is a reliable vehicle, it is prone to a few common A/C issues:

• Compressor Failures: The A/C compressor is the heart of the system, and it is not uncommon for it to fail. Symptoms of a failing compressor include a lack of cold air, strange noises coming from the engine bay, and a visible clutch that is not engaging.
• Condenser Issues: The condenser is located in front of the radiator, which makes it susceptible to damage from road debris. A damaged condenser can leak refrigerant, leading to a loss of cooling.
• Evaporator Leaks: The evaporator is located inside the dashboard, and it is responsible for cooling the air that blows into the cabin. A leaking evaporator can be difficult to diagnose, but common symptoms include a musty smell coming from the vents and a loss of cooling.

When to call a pro

While some A/C maintenance can be performed by a DIYer, there are certain situations where it is best to call a professional. If you are not comfortable working with refrigerants, or if you do not have the proper equipment, it is best to leave the job to a certified technician. Additionally, if you are experiencing a loss of cooling, it is important to have the system properly diagnosed to determine the cause of the problem.

Disclaimer: The information in this article is for informational purposes only. It is not intended to be a substitute for professional advice. Always consult with a certified technician before servicing your vehicle's A/C system. EPA 609 certification is required to work on A/C systems.

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