2019 Chevrolet Silverado 1500 A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 18 oz (510g)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 6.0 oz (180 mL)
• Low-Side Service Port Location: On the accumulator/dryer, typically located near the passenger side firewall.
• High-Side Service Port Location: On the A/C line, typically found on the passenger side, closer to the condenser.

Why R-1234yf Matters

The 2019 Chevrolet Silverado 1500 uses R-1234yf refrigerant, a significant change from the R-134a used in older vehicles. This transition began around 2014 for many manufacturers, driven by environmental regulations aimed at reducing the global warming potential (GWP) of refrigerants. R-1234yf has a GWP significantly lower than R-134a, making it a more eco-friendly choice.

However, this change comes with implications. R-1234yf is often more expensive than R-134a. Additionally, working with R-1234yf requires specialized recovery and charging equipment. Standard R-134a machines cannot be used, and technicians must be properly trained and certified for handling R-1234yf to prevent cross-contamination and ensure safe, effective service.

Recharge Procedure

Recharging your A/C system is not as simple as just adding a can of refrigerant. For the best performance and longevity of your Silverado's A/C system, a precise procedure is critical:

1. Evacuation: The system must be thoroughly evacuated using a vacuum pump to remove all air and moisture. Moisture in the A/C system can lead to component damage and poor cooling performance.
2. Leak Testing: Before recharging, the system should be tested for leaks. Even small leaks can lead to refrigerant loss and system failure.
3. Proper Charge by Weight: Always charge by weight, not by pressure. The specified refrigerant charge (18 oz or 510g for your 2019 Silverado 1500) is crucial. Too little refrigerant will result in poor cooling, while too much can cause damage to the compressor and other components. Pressure readings can be misleading due to ambient temperature variations and are not a reliable method for determining the correct charge.
4. PAG Oil: Ensure the correct type (PAG 46) and amount (6.0 oz / 180 mL) of PAG oil is in the system. PAG oil lubricates the compressor, and an incorrect amount can lead to premature compressor failure.

Common A/C Problems for This Vehicle

While the 2019 Silverado 1500 is a relatively new vehicle, some common A/C issues can arise:

• Compressor Failures: Although less common in newer vehicles, compressor failures can occur due to improper lubrication (incorrect PAG oil level or type), contamination, or electrical issues. Symptoms include a loud noise from the compressor, lack of cold air, or the compressor not engaging.
• Condenser Issues: The condenser, located in front of the radiator, can be susceptible to damage from road debris, leading to leaks. It can also become clogged with dirt and debris, reducing its efficiency and affecting cooling performance.
• Evaporator Leaks: The evaporator, located inside the dashboard, can develop leaks over time. These are often difficult to diagnose without specialized leak detection equipment and can lead to a musty odor from the vents along with poor cooling.
• Electrical Issues: Problems with pressure sensors, relays, or the climate control module can prevent the A/C system from operating correctly.

When to Call a Pro

Given the complexities of R-1234yf systems and the need for specialized tools and knowledge, A/C system repairs are generally best left to certified professionals. If you notice any of the following, it's time to call a professional:

• The A/C system is blowing warm air.
• There are unusual noises coming from the A/C system.
• You see visible leaks under the vehicle.
• The A/C system cycles on and off rapidly.
• There is a musty or unusual odor from the vents.

Safety Disclaimer: Automotive A/C refrigerants are federally regulated. It is illegal to intentionally vent refrigerants into the atmosphere. Improper handling of refrigerants can also cause personal injury. Always wear appropriate personal protective equipment (PPE) when working with refrigerants. You must be EPA 609 certified to handle refrigerants legally. We strongly recommend seeking professional service for A/C repair and maintenance.

Find a certified A/C shop on Repairius.