2017 GMC Sierra 1500 A/C Refrigerant & Oil

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 1.48 lbs (23.68 oz / 671 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 6.0 oz (177 mL)
• Low-Side Service Port Location: On the accumulator/dryer, usually on the passenger side near the firewall.
• High-Side Service Port Location: On the high-pressure line, typically closer to the condenser on the passenger side, sometimes near the radiator.

Why R-1234yf Matters

The 2017 GMC Sierra 1500 uses R-1234yf refrigerant, a significant change from the older R-134a. This transition, which began around Model Year 2014 for many manufacturers, was driven by environmental concerns. R-1234yf has a much lower Global Warming Potential (GWP) compared to R-134a, aligning with stricter environmental regulations.

However, this change comes with several implications:

• Cost: R-1234yf is considerably more expensive than R-134a.
• Environmental Impact (EPA): Its lower GWP makes it the preferred choice for reducing greenhouse gas emissions from mobile air conditioning systems.
• Recovery Machine Requirements: Due to its mild flammability and specific handling requirements, specialized R-1234yf certified recovery, recycling, and recharging (RRR) equipment is mandated by the EPA. This equipment prevents cross-contamination with R-134a and ensures safe operation.

Recharge Procedure

Recharging your 2017 GMC Sierra 1500 A/C system requires precision and the correct equipment. Always evacuate the system thoroughly before recharging. This removes any moisture and air, which can cause significant damage and reduce cooling efficiency. Critically, the refrigerant charge must be done by weight, not by pressure gauges alone. The specified charge for your Sierra is 1.48 lbs (23.68 oz or 671 grams). Using an accurate A/C charging machine that charges by weight is essential for optimal performance and to prevent over or undercharging, both of which can lead to system damage.

Safety Note: Working with refrigerants requires specific training and EPA 609 certification. Improper handling can lead to personal injury and environmental damage. This information is for educational purposes only. If you are not EPA 609 certified, do not attempt to service your vehicle's A/C system yourself.

Common A/C Problems for This Vehicle

While the GMC Sierra 1500 is a robust truck, certain A/C issues can arise:

• Compressor Failures: The A/C compressor is the heart of the system. Failures can be due to natural wear and tear, lack of proper lubrication (PAG oil), or contamination within the system. Symptoms include a loud grinding noise, no cold air, or the compressor not engaging.
• Condenser Issues: The condenser, located in front of the radiator, dissipates heat. It's susceptible to damage from road debris, which can cause leaks. A clogged condenser can also lead to poor cooling performance.
• Evaporator Leaks: The evaporator core, usually located behind the dashboard, cools the air entering the cabin. Leaks here are less common but can be challenging to diagnose and repair, often requiring significant dashboard disassembly. A sweet, musty odor or visible moisture inside the cabin can indicate an evaporator leak.
• Electrical Problems: Issues with pressure switches, relays, or the A/C control module can prevent the system from operating correctly.

When to Call a Pro

Given the complexity of modern A/C systems, especially those using R-1234yf, and the specialized equipment required, it's often best to call a professional for diagnosis and repair. If you experience any of the following, seek professional help:

• No cold air from the vents.
• Intermittent cooling.
• Unusual noises coming from the engine bay when the A/C is on.
• Visible leaks (e.g., green dye) under the vehicle.
• A strange odor when the A/C is running.

Only a certified technician has the proper tools, knowledge, and EPA certification to safely and effectively diagnose and repair your 2017 GMC Sierra 1500's A/C system.

Find a certified A/C shop on Repairius.