2021 Ram 3500 A/C Refrigerant & Oil Capacity Guide

Maintaining your 2021 Ram 3500's air conditioning system is crucial for comfort, especially if you're hauling heavy loads or working in hot conditions. This guide provides essential information on refrigerant type, capacities, and best practices for keeping your A/C running efficiently.

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, near the firewall on the passenger side.
• High-Side Service Port Location: On the liquid line, near the condenser on the passenger side.

Why R-1234yf Matters

If you've owned older vehicles, you might be familiar with R-134a refrigerant. However, your 2021 Ram 3500 utilizes R-1234yf. This transition, which began around 2014 for many manufacturers, was driven by environmental concerns. R-1234yf has a significantly lower Global Warming Potential (GWP) compared to R-134a, making it more environmentally friendly.

This change comes with several implications:

• Cost: R-1234yf is generally more expensive than R-134a due to its newer technology and lower production volume.
• EPA Regulations: The EPA mandates the use of approved refrigerants to reduce environmental impact.
• Recovery Machine Requirements: Specialized A/C recovery and recharging equipment is required for R-1234yf systems. Mixing refrigerants or using equipment designed for R-134a can lead to system damage and is illegal.

Recharge Procedure

Diagnosing and recharging an A/C system should always be done with precision. For a 2021 Ram 3500 with R-1234yf, the procedure is as follows:

1. Evacuation is Key: Before introducing any new refrigerant, the system must be evacuated using a vacuum pump. This removes all air and moisture, which can severely damage A/C components and reduce efficiency.
2. Proper Charge by Weight: Always charge your A/C system by weight, not just by pressure readings. Your Ram 3500's system capacity is 22 oz (624 grams) of R-1234yf. Using an A/C charging machine that measures by weight ensures the correct amount of refrigerant, preventing over- or under-charging, both of which can harm the system.
3. PAG Oil Considerations: When replacing components like the compressor, ensure you add the correct amount and type of PAG 46 oil. An A/C system requires a specific amount of oil to lubricate internal components. Most new compressors come pre-charged with oil, but you'll need to drain and measure it, then add any additional oil to reach the total system capacity if other components have been replaced and retain oil in them.

A word of caution: Do NOT use