2017 Subaru Forester A/C Refrigerant and Oil Specifications

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 14.1 - 15.9 oz (400 - 450 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 4.4 - 5.1 fl oz (130 - 150 mL)
• Low-Side Service Port Location: Typically on the accumulator/drier, near the firewall on the passenger side.
• High-Side Service Port Location: Usually on the refrigerant line near the condenser, in front of the radiator on the passenger side.

Why R-1234yf Matters

For your 2017 Subaru Forester, the A/C system uses R-1234yf refrigerant. This is a significant change from the older R-134a refrigerant, primarily driven by environmental regulations. R-1234yf has a much lower Global Warming Potential (GWP) compared to R-134a, making it more environmentally friendly.

This transition means a few things for vehicle owners. First, the cost of R-1234yf refrigerant is generally higher than R-134a. Second, specialized equipment is required for its recovery and recharging. This is because R-1234yf is mildly flammable, demanding specific safety protocols and recovery machines designed for this refrigerant. Attempting to mix R-134a and R-1234yf can damage the A/C system and is illegal. Always ensure any service facility you use is equipped and certified to handle R-1234yf.

Recharge Procedure Cautions

Recharging your 2017 Subaru Forester's A/C system is not as simple as attaching a can of refrigerant. The most crucial aspect of an A/C recharge is evacuating the system and charging by weight. Evacuation removes all air and moisture from the system, which can cause corrosion and hinder cooling performance. Charging by weight, using a precise scale, ensures the correct amount of refrigerant is added. Overcharging or undercharging can lead to poor cooling, increased strain on components, and potential system damage. Relying solely on pressure readings can be misleading and lead to improper charging. Always refer to the OEM service information for the most accurate and up-to-date procedures.

Common A/C Problems for the 2017 Subaru Forester

While the Subaru Forester is a generally reliable vehicle, some A/C issues can arise:

• Compressor Failures: The A/C compressor is a vital component. Issues can include unusual noises (clunking, grinding), clutch engagement problems, or a complete lack of cooling. Compressor failures can sometimes be caused by improper refrigerant levels or contaminated PAG oil.
• Condenser Issues: The condenser, located in front of the radiator, can be susceptible to damage from road debris, leading to leaks. A clogged condenser, often from dirt or leaves, can also restrict airflow and reduce cooling efficiency.
• Evaporator Leaks: The evaporator core, located inside the dashboard, can develop leaks over time. Symptoms often include a musty odor from the vents (due to refrigerant escaping, allowing moisture to collect) and a gradual loss of cooling. Evaporator leaks are more challenging to diagnose and repair due to their location.
• Electrical Issues: Wiring problems, faulty relays, or sensor malfunctions can all impact A/C system operation, leading to intermittent cooling or complete failure.

When to Call a Pro

While some basic troubleshooting can be done, A/C system repairs require specialized tools, knowledge, and an EPA 609 certification for handling refrigerants. If you're experiencing any of the following, it's best to consult a certified professional:

• The A/C system is blowing warm air.
• You hear unusual noises when the A/C is on.
• There's a noticeable leak under your vehicle.
• The A/C system cycles on and off frequently.
• You suspect a refrigerant leak.

Safety Disclaimer: Working with automotive air conditioning systems can be dangerous. Refrigerants are under high pressure and can cause frostbite or other injuries. Always wear appropriate personal protective equipment (PPE) and never attempt to discharge refrigerants into the atmosphere, as it is illegal and harmful to the environment. Only EPA 609 certified technicians are authorized to work on vehicle A/C systems involving refrigerant handling.

Find a certified A/C shop on Repairius.