2015 Subaru Forester A/C Refrigerant and Oil Guide

Quick Answer: 2015 Subaru Forester A/C Specs

• Refrigerant Type: R-134a
• Full System Charge: 21.1 oz +/- 0.9 oz (600g +/- 25g)
• PAG Oil Type: PAG 46 (Specifically, DH-PR)
• Total System Oil Capacity: 4.1 oz (120 mL) - Note: This is for a dry system; only add what was removed.
• Low-Side Port Location: Near the firewall on the passenger side, on the larger diameter A/C line.
• High-Side Port Location: In front of the radiator, near the hood latch.

Why R-134a is Still The Standard (For This Model)

While the automotive industry began a transition to the more environmentally friendly R-1234yf refrigerant around 2014, your 2015 Subaru Forester still uses the long-standing R-134a. This is good news for the DIYer, as R-134a is significantly less expensive and more readily available than its newer counterpart. However, the environmental impact of R-134a is what prompted the change. It has a much higher Global Warming Potential (GWP) than R-1234yf. This is why it's illegal to knowingly vent R-134a into the atmosphere. You must use a recovery machine to capture any refrigerant before opening the system for repairs.

Recharge Procedure: It's About Weight, Not Pressure

Topping off an A/C system with a can from the auto parts store is a common practice, but it's not the correct one. A/C systems are critically charged, meaning they are designed to work with a precise weight of refrigerant. The only way to ensure the correct charge is to follow the professional procedure:

1. Recover: Any existing refrigerant in the system must be recovered using an EPA-approved machine.
2. Evacuate: The system is placed under a deep vacuum for at least 30-45 minutes. This boils off any moisture, which can turn into corrosive acid when mixed with refrigerant and oil.
3. Recharge: The exact refrigerant weight specified by Subaru (21.1 oz) is weighed and charged back into the system.

Using pressure gauges alone to determine charge is inaccurate. Ambient temperature, humidity, and engine RPM all affect pressures, leading to a potential undercharge or overcharge, both of which cause poor cooling and can damage the compressor.

Common A/C Problems for the 2015 Subaru Forester

This generation of Forester (2014-2018) is generally reliable, but some common A/C issues can arise:

• Condenser Damage: Located at the very front of the car, the condenser is susceptible to damage from road debris like rocks and stones. A small puncture will lead to a complete loss of refrigerant.
• Compressor Clutch/Coil Failure: Sometimes the compressor itself is fine, but the electromagnetic clutch that engages it fails. You might hear a click when you turn on the A/C, but the compressor pulley won't engage. This is often a more affordable repair than a full compressor replacement.
• Evaporator Core Leaks: While less common, leaks can develop in the evaporator core (located inside the dashboard). Symptoms often include a musty smell from the vents and a gradual loss of cooling performance. This is a labor-intensive repair as it requires removing the entire dashboard.

When to Call a Pro

While checking for obvious signs of leaks or a disengaged compressor clutch is within the realm of a savvy DIYer, any task that involves opening the refrigerant circuit should be left to a professional. This includes replacing a compressor, condenser, or hose. A certified technician has the expensive recovery/recharge equipment and the training to handle refrigerants safely and legally.

EPA SAFETY DISCLAIMER: Handling automotive refrigerants requires EPA 609 certification. It is illegal to purchase and handle R-134a without this certification in many jurisdictions and illegal to vent it to the atmosphere. Always wear safety glasses and gloves when working near the A/C system.

Find a certified A/C shop on Repairius.