2019 GMC Yukon A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 22.93 oz (650 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 6.0 oz (180 mL)
• Low-Side Service Port Location: On the accumulator/drier, near the firewall on the passenger side.
• High-Side Service Port Location: On the A/C line, typically closer to the condenser, often on the passenger side.

Why R-1234yf Matters for Your 2019 GMC Yukon

Your 2019 GMC Yukon utilizes R-1234yf refrigerant, a significant change primarily driven by environmental regulations. Starting around 2014, automotive manufacturers began transitioning from the older R-134a refrigerant to R-1234yf due to its much lower Global Warming Potential (GWP). This means R-1234yf has a less harmful impact on the environment if released into the atmosphere.

While this is excellent news for the planet, it has implications for vehicle owners and technicians. R-1234yf is considerably more expensive than R-134a. Furthermore, specialized recovery and recharging equipment is required to handle R-1234yf, as it is mildly flammable. This means that not all A/C shops are equipped to service vehicles with this refrigerant, and DIY methods using R-134a cans are strictly incompatible and dangerous.

Recharge Procedure for Your 2019 GMC Yukon A/C

Recharging your 2019 GMC Yukon's A/C system properly is crucial for its efficient operation and longevity. It's not as simple as just adding refrigerant until the pressure "looks good." The most critical step is accurate charging by weight, not pressure readings. An undercharged or overcharged system will not cool effectively and can lead to premature component failure.

1. Evacuation: The first and most vital step is to evacuate the system. This involves using a vacuum pump to remove all air and moisture from the A/C system. Moisture is highly detrimental to A/C components, forming corrosive acids that can destroy the compressor and other parts.
2. Leak Test: After evacuation, a vacuum hold test should be performed to ensure there are no leaks in the system. Even small leaks can lead to refrigerant loss over time.
3. PAG Oil Addition: If components were replaced or the system was opened, the correct amount and type of PAG 46 oil must be added. Refer to service information for exact amounts based on replaced components. Your Yukon typically uses 6.0 oz (180 mL) for a full system charge.
4. Refrigerant Charging by Weight: Using a specialized R-1234yf charging station, the precise amount of refrigerant (22.93 oz or 650 grams for your Yukon) is charged into the system. This ensures optimal performance and prevents system damage.

Never rely on pressure gauges alone to determine the correct charge, especially with R-1234yf systems. The only accurate method is to charge by weight using an appropriate A/C machine.

Common A/C Problems for This Generation GMC Yukon

While the 2019 GMC Yukon is generally reliable, some common A/C issues can arise:

• Compressor Failures: The A/C compressor is a complex component, and failures can occur due to lack of lubrication (low refrigerant/oil), contamination, or electrical issues. Symptoms include a loud grinding noise, no cold air, or the compressor not engaging.
• Condenser Issues: The condenser, located in front of the radiator, is susceptible to damage from road debris. A clogged or damaged condenser can restrict airflow and hinder the system's ability to dissipate heat, leading to poor cooling.
• Evaporator Leaks: The evaporator core, usually located behind the dashboard, can develop leaks. These are often difficult to diagnose without specialized leak detection equipment and can result in a musty odor or visible moisture inside the cabin.
• Blend Door Actuator Failures: While not a refrigerant problem, faulty blend door actuators are common and can cause inconsistent temperature control or air not blowing from the correct vents.

When to Call a Pro

Given the complexities of R-1234yf systems, the specialized equipment required, and the environmental regulations surrounding refrigerants, it is highly recommended to seek professional assistance for any A/C issues beyond basic cabin filter replacement.

Safety Disclaimer: Working with automotive air conditioning systems and refrigerants can be dangerous. Refrigerants can cause frostbite on contact, and improper handling can lead to serious injury or environmental harm. It is mandatory for anyone handling refrigerants professionally to be EPA Section 609 certified. Attempting to service an R-1234yf system without the proper training, tools, and certification is risky and can result in costly damage or personal injury.

Find a certified A/C shop on Repairius.