2019 Ram 3500 A/C Refrigerant & Oil Capacity

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 22 oz (624 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 7.0 oz (207 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, near the condenser, usually in front of the radiator on the passenger side.

Why R-1234yf Matters

Starting around 2014, the automotive industry began transitioning from R-134a to R-1234yf refrigerant in new vehicles, a change driven by environmental regulations. The 2019 Ram 3500 utilizes R-1234yf, a hydrofluoroolefin (HFO) refrigerant with a significantly lower Global Warming Potential (GWP) compared to R-134a. This means R-1234yf has a much smaller impact on climate change if released into the atmosphere.

However, this environmental benefit comes with some practical implications:

• Cost: R-1234yf is considerably more expensive than R-134a, which can lead to higher repair costs if your system needs a recharge or component replacement.
• EPA and Environmental Regulations: Due to its specific properties and environmental mandates, R-1234yf systems require specialized equipment for recovery and recycling. It is illegal to intentionally vent R-1234yf into the atmosphere.
• Recovery Machine Requirements: Service shops need dedicated R-1234yf recovery, recycling, and recharging machines. These machines are designed to prevent cross-contamination with R-134a and ensure proper handling of the refrigerant.

Recharge Procedure

Recharging an A/C system is not as simple as just adding refrigerant until the pressure looks right. For a 2019 Ram 3500, proper A/C service requires precision and adherence to manufacturer specifications. Always evacuate the system thoroughly before recharging and add refrigerant by weight, not by pressure gauges alone. This ensures the correct amount of refrigerant is in the system, which is crucial for optimal performance and longevity of A/C components. Overcharging or undercharging can both lead to poor cooling, increased fuel consumption, and premature compressor failure.

Safety Disclaimer: Working with refrigerants requires specialized knowledge, tools, and safety precautions. Improper handling can lead to serious injury, environmental damage, and legal penalties. The EPA's Section 609 certification is required for anyone performing A/C work in the United States. If you are not certified, it is strongly recommended that you seek a professional.

Common A/C Problems for This Vehicle

While the Ram 3500 is a robust truck, its A/C system can develop common issues:

• Compressor Failures: The A/C compressor is the heart of the system. Issues can range from internal wear and tear to clutch problems. Loud noises, lack of cooling, or a cycling compressor are all signs of potential compressor trouble.
• Condenser Issues: The condenser, located in front of the radiator, is exposed to road debris. Damage from rocks or debris can lead to leaks. Additionally, clogged condenser fins can restrict airflow and reduce cooling efficiency.
• Evaporator Leaks: The evaporator core, hidden inside the dashboard, can develop leaks over time. Signs of an evaporator leak often include a musty odor from the vents (due to moisture buildup) and a gradual loss of refrigerant, leading to diminished cooling performance. Detecting and repairing these leaks can be labor-intensive.

These issues are not unique to the Ram 3500 but are common across many modern vehicles. Regular maintenance and prompt attention to any cooling problems can help mitigate these issues.

When to Call a Pro

Given the complexity of R-1234yf systems and the need for expensive specialized equipment, it is almost always best to call a professional for A/C diagnostics and repairs on your 2019 Ram 3500. A qualified technician will have the proper tools to accurately diagnose the problem, recover any remaining refrigerant, repair the issue, and recharge the system to factory specifications, ensuring your A/C works efficiently and reliably.

Find a certified A/C shop on Repairius.