2024 GMC Sierra 1500: A/C Refrigerant & Oil Specifications

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 21.9 oz (620g)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 4.1 oz (120mL)
• Low-Side Port Location: Near the firewall on the passenger side
• High-Side Port Location: In front of the radiator on the passenger side

Why R-1234yf Matters

The 2024 GMC Sierra 1500 uses R-1234yf refrigerant, which has a lower global warming potential (GWP) than the R-134a used in older vehicles. This change was mandated by the EPA starting with the 2014 model year. While better for the environment, R-1234yf is more expensive and requires special equipment for service. You cannot top off an R-1234yf system with R-134a, and the service ports are different to prevent accidental mixing.

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 moisture and air before being recharged with the precise weight of refrigerant specified by the manufacturer. Overcharging or undercharging can lead to poor performance and damage to the A/C system. It is highly recommended to have this service performed by a certified technician with the proper equipment.

Common A/C Problems for This Vehicle

• Compressor Failures: The A/C compressor is the heart of the system and can fail due to internal wear or leaks. Common symptoms include a grinding noise, a seized clutch, or a lack of cooling.
• Condenser Issues: The condenser is located in front of the radiator and is susceptible to damage from road debris. A clogged or damaged condenser will not be able to dissipate heat properly, leading to poor cooling.
• Evaporator Leaks: The evaporator is located inside the dashboard and can develop leaks, which are often difficult to detect. A musty smell from the vents or a loss of refrigerant are common signs of an evaporator leak.

When to Call a Pro

While some basic A/C maintenance can be performed by a DIYer, any work involving the handling of refrigerant should be left to a professional. A certified technician will have the proper equipment and training to safely and effectively service your A/C system. They can also diagnose and repair any underlying issues that may be causing your A/C to not blow cold.

Disclaimer: It is illegal to handle refrigerants without an EPA 609 certification. Attempting to service your own A/C system without the proper training and equipment can result in injury and damage to your vehicle.

Find a certified A/C shop on Repairius.