2025 Toyota Highlander A/C Refrigerant and Oil Specifications

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 19.4 oz (550g)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 4.1 oz (120mL)
• Low-Side Service Port Location: Near the firewall, on the passenger side
• High-Side Service Port Location: In front of the radiator, on the driver side

Why R-1234yf Matters

The 2025 Toyota Highlander uses R-1234yf refrigerant, which has a much lower global warming potential than the R-134a used in older vehicles. This change was mandated by the EPA starting in 2014, and most new vehicles now use R-1234yf. While it is better for the environment, R-1234yf is also more expensive and requires special equipment for service. You cannot use an R-134a recovery machine with an R-1234yf system, and the two refrigerants cannot be mixed.

Recharge Procedure

A proper A/C recharge is not a simple top-off. The system must be evacuated with a vacuum pump to remove any air and moisture. Then, the correct amount of refrigerant must be added by weight, not pressure. This is the only way to ensure the system is properly charged and will perform as designed. Overcharging or undercharging can damage the compressor and other components.

Common A/C Problems for This Vehicle

While the 2025 Highlander is a new vehicle, common A/C problems in previous generations include:

• Compressor failures: The A/C compressor is the heart of the system, and it can fail for a variety of reasons, including lack of lubrication, a refrigerant leak, or an electrical problem.
• Condenser issues: The condenser is located in front of the radiator, and it is susceptible to damage from road debris. A clogged or damaged condenser will not be able to properly cool the refrigerant, which will affect A/C performance.
• Evaporator leaks: The evaporator is located inside the dashboard, and it is responsible for cooling the air that blows into the cabin. A leak in the evaporator can be difficult to diagnose and repair.

When to Call a Pro

If you are not familiar with A/C systems, it is best to leave the work to a professional. A/C systems are complex and can be dangerous to work on if you do not know what you are doing. A certified technician will have the proper tools and equipment to safely and effectively service your A/C system.

Disclaimer: The information on this page is for reference only. Always consult the vehicle's service manual or a certified technician for the most accurate and up-to-date information. You must be EPA 609 certified to legally service automotive A/C systems.

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