2017 Toyota Highlander A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 16.9 oz (480 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 6.0 oz (180 mL)
• Low-Side Service Port: On the large diameter aluminum line running from the evaporator to the compressor, typically near the firewall on the passenger side.
• High-Side Service Port: On the small diameter aluminum line running from the condenser (front of the vehicle) to the expansion valve/evaporator inlet, often near the passenger side strut tower.

Why R-1234yf Matters

For your 2017 Toyota Highlander, the air conditioning system uses R-1234yf refrigerant. This is a significant change from the older R-134a refrigerant, which was common in vehicles prior to 2014. The transition to R-1234yf was driven by environmental concerns, as it has a much lower Global Warming Potential (GWP) than R-134a. This means it contributes less to climate change if released into the atmosphere.

This shift brings a few crucial considerations for owners and technicians:

• Cost: R-1234yf is significantly more expensive than R-134a, which can impact the cost of A/C repairs or recharges.
• EPA Regulations: Due to its environmental impact, the EPA has mandated the transition to lower GWP refrigerants. This also means specific regulations apply to handling R-1234yf, including requirements for certified technicians and specialized recovery equipment.
• Recovery Machine Requirements: Servicing an R-1234yf system requires dedicated recovery, recycling, and recharging (RRR) equipment designed specifically for this refrigerant. Using R-134a equipment on an R-1234yf system (or vice-versa) can lead to cross-contamination and damage to the A/C system and equipment.

Recharge Procedure Cautions

Recharging your Highlander's A/C system is not as simple as just adding a can of refrigerant. It's a precise process that, if done incorrectly, can lead to poor performance or costly damage. Here are the critical points:

• Evacuation is Key: Before adding any new refrigerant, the system must be evacuated to remove all moisture and non-condensable gases. Moisture in the system can combine with refrigerant to form corrosive acids, leading to compressor failure and other component damage. Non-condensables reduce system efficiency.
• Charge by Weight, Not Pressure: Always charge the system by weight according to the manufacturer's specifications (16.9 oz or 480 grams for your Highlander). Relying solely on pressure readings can lead to over or undercharging, both of which negatively impact performance and can harm the compressor. Professional A/C machines charge by weight for accuracy.
• Proper PAG Oil: Ensure the correct type and amount of PAG 46 oil are used. The A/C compressor needs this oil for lubrication. Incorrect oil type or insufficient quantity will cause compressor failure. Your Highlander requires 6.0 oz (180 mL) of PAG 46 oil.
• No "Top-Offs": If your system is low on refrigerant, it means there's a leak. Simply topping it off is a temporary fix and does not address the root cause, leading to continued refrigerant loss and potential system damage.

Common A/C Problems for This Vehicle

While the Toyota Highlander is generally reliable, some common A/C issues can arise in this generation:

• Compressor Failures: The A/C compressor is the heart of the system. Failures can be due to lack of lubrication (incorrect oil or leaks), normal wear and tear, or contamination within the system. Symptoms include no cold air, grinding noises, or a seized clutch.
• Condenser Issues: Located at the front of the vehicle, the condenser is susceptible to damage from road debris. A damaged condenser can lead to refrigerant leaks and reduced cooling efficiency.
• Evaporator Leaks: The evaporator, hidden deep in the dashboard, can develop leaks over time. These are often difficult and costly to repair due to the labor involved in accessing the component. A musty smell when the A/C is on can sometimes indicate an evaporator leak or mold growth.
• Blend Door Actuator Problems: While not directly a refrigerant issue, problems with the blend door actuators can prevent proper temperature control, making it seem like the A/C isn't working correctly when it actually is.

When to Call a Pro

Given the complexities of R-1234yf systems and the need for specialized equipment, it's highly recommended to consult a certified professional for any A/C servicing beyond basic visual inspections. An ASE-certified technician with EPA 609 certification will have the knowledge and tools to:

• Accurately diagnose the problem.
• Properly recover and recycle refrigerant.
• Identify and repair leaks.
• Evacuate and recharge the system to factory specifications.
• Ensure the correct type and amount of PAG oil are used.

Safety Disclaimer: Working with automotive refrigerants requires specialized knowledge and equipment. Refrigerants can cause frostbite if they contact skin or eyes, and inhaling high concentrations can be dangerous. Improper handling can damage your vehicle's A/C system and harm the environment. Federal law prohibits the venting of refrigerants into the atmosphere. For these reasons, all A/C work should be performed by an EPA 609 certified technician.

Find a certified A/C shop on Repairius.