2014 GMC Sierra 2500HD A/C Refrigerant and Oil Specifications

Quick answer: 2014 GMC Sierra 2500HD A/C specs

• Refrigerant type: R-134a
• Full system charge: 25.4 oz (720g)
• PAG oil type: PAG 46
• PAG oil amount: 3.5 oz (105mL)
• Low-side service port location: Near the firewall on the passenger side
• High-side service port location: In front of the radiator on the passenger side

Why R-1234yf matters

While the 2014 GMC Sierra 2500HD still uses R-134a refrigerant, it's important to be aware of the newer R-1234yf standard. This refrigerant has a much lower global warming potential (GWP) than R-134a, making it better for the environment. However, it's also more expensive and requires special equipment for service. R-1234yf systems are not compatible with R-134a, so it's crucial to use the correct refrigerant for your vehicle.

Recharge procedure

A proper A/C recharge is not just about adding refrigerant. The system must be evacuated to remove any air or moisture, which can cause damage to the A/C components. Here's a high-level overview of the process:

1. Evacuate the system: This is done with a vacuum pump to remove all air and moisture.
2. Charge the system: The correct amount of refrigerant is added to the system by weight, not pressure. This is the only way to ensure a full and accurate charge.
3. Check for leaks: The system should be checked for leaks before and after charging to ensure there are no issues.

Common A/C problems for this vehicle

• Compressor failure: The A/C compressor is a common failure point on these trucks. Symptoms of a failing compressor include a grinding noise, a lack of cold air, or a seized compressor clutch.
• Condenser issues: The condenser is located in front of the radiator and is susceptible to damage from road debris. A clogged or damaged condenser can cause the A/C to not blow cold.
• Evaporator leaks: The evaporator is located inside the dashboard and can be difficult to access. A leaking evaporator will cause a loss of refrigerant and a lack of cold air.

When to call a pro

While it's possible to recharge your own A/C system, it's not recommended unless you have the proper training and equipment. An improper charge can cause damage to the A/C system and can be dangerous. It's always best to have a certified A/C technician service your system.

Disclaimer: It is illegal to handle refrigerants without an EPA 609 certification. Always wear safety glasses and gloves when working on your A/C system.

Find a certified A/C shop on Repairius.