2017 GMC Yukon A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 22 oz (624 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 6.7 oz (200 mL)
• Low-Side Service Port Location: On the accumulator, typically near the firewall on the passenger side.
• High-Side Service Port Location: On the A/C line, typically near the condenser on the passenger side.

Why R-1234yf Matters

For your 2017 GMC Yukon, the A/C system uses R-1234yf refrigerant, a standard that became increasingly common after 2014 due to environmental concerns. This specific refrigerant has a lower Global Warming Potential (GWP) compared to the older R-134a. While R-1234yf is better for the environment, it also comes with a few implications for you as a vehicle owner.

First, the cost of R-1234yf is significantly higher than R-134a. This can make A/C system repairs or recharges more expensive. Second, due to its flammability characteristics, specialized recovery and recharge equipment is required. This means that not all shops might be equipped to service your Yukon's A/C system, and it's crucial to choose a facility with the proper EPA Section 609 certified equipment and technicians.

Recharge Procedure

Recharging your 2017 GMC Yukon's A/C system is not as simple as just adding a can of refrigerant. It's a precise process that requires specialized tools and knowledge. Here's a high-level overview, emphasizing critical steps:

1. Evacuation: Before adding any new refrigerant, the system must be evacuated using a vacuum pump. This removes any moisture and air from the system, which can cause significant damage and reduce cooling performance. Moisture can react with refrigerant to form corrosive acids, damaging internal components.
2. Leak Testing: After evacuation, the system should be held under vacuum to ensure there are no leaks. If a leak is present, adding refrigerant is futile and harmful to the environment.
3. Proper Charge by Weight: The most critical step is charging the system with the exact amount of refrigerant by weight – 22 ounces (624 grams) for your 2017 Yukon. Relying on pressure gauges alone to determine the correct charge is highly inaccurate and can lead to over or undercharging, both of which can damage the compressor and reduce cooling efficiency. Use a dedicated refrigerant charging machine for accuracy.
4. PAG Oil: Ensure the correct type of PAG 46 oil is used. If components are replaced, the appropriate amount of new oil needs to be added to maintain proper lubrication of the compressor. The total system capacity for PAG oil is 6.7 oz (200 mL).

Safety First: A/C refrigerants are under high pressure and can cause frostbite or other injuries if mishandled. Always wear appropriate personal protective equipment, including safety glasses and gloves, and never vent refrigerant into the atmosphere. This is illegal and harmful to the environment. An EPA 609 certification is required for anyone performing A/C work professionally.

Common A/C Problems for this Vehicle

While the 2017 GMC Yukon is a reliable vehicle, certain A/C issues can arise:

• Compressor Failures: The A/C compressor is the heart of the system. Issues can range from electrical problems (clutch not engaging) to internal mechanical failures, often indicated by a loud grinding noise or no cold air. Low refrigerant levels or improper lubrication are common culprits.
• Condenser Issues: Located at the front of the vehicle, the condenser is susceptible to damage from road debris. A leak in the condenser will cause a loss of refrigerant. Additionally, a clogged condenser (from dirt or leaves) can hinder heat transfer, reducing cooling performance.
• Evaporator Leaks: The evaporator is inside the dashboard and can be a challenging component to access and replace. Leaks here are often slow and can manifest as a musty smell due to refrigerant mixing with moisture, or simply a gradual loss of cooling ability. Sometimes, green UV dye (if previously added) can be seen draining from the evaporator drain tube.

When to Call a Pro

Given the complexities of R-1234yf systems and the need for specialized equipment, it's highly recommended to call a professional HVAC technician or an A/C specialist if you experience any issues with your 2017 GMC Yukon's A/C system. Symptoms like warm air from the vents, unusual noises when the A/C is on, or a complete lack of cooling all warrant professional diagnosis. Attempting DIY repairs without the proper tools and training can lead to further damage and higher repair costs.

Find a certified A/C shop on Repairius.