2019 Ram ProMaster A/C Refrigerant and Oil Specifications

Quick Answer

• Refrigerant Type: R-1234yf
• System Charge: 24.7 oz (700g) for front A/C only; 35.3 oz (1000g) with optional rear A/C.
• PAG Oil Type: PAG 46
• Oil Capacity: 4.0 oz (120 mL) for a total system fill.
• Low-Side Port: Passenger side of the engine bay, on the larger A/C line coming off the firewall.
• High-Side Port: Near the top of the condenser at the front of the vehicle, in front of the radiator.

Why R-1234yf Matters

The 2019 Ram ProMaster uses R-1234yf refrigerant, a newer, more environmentally friendly alternative to the older R-134a. This is important for a few reasons:

• Cost: R-1234yf is significantly more expensive than R-134a. A full system charge can cost several hundred dollars in refrigerant alone.
• EPA Regulations: Due to its lower Global Warming Potential (GWP), R-1234yf is now mandated in new vehicles. It is illegal to top off a leaking system; the leak must be repaired before recharging.
• Specialized Equipment: Servicing R-1234yf systems requires specific, dedicated equipment. You cannot use R-134a gauges or recovery machines on an R-1234yf system, as this can cause contamination and damage.

Recharge Procedure

A proper A/C recharge is not a "top-off." The correct procedure involves:

1. Evacuation: The system must be fully evacuated using a recovery machine to remove all old refrigerant and non-condensable gases like air.
2. Vacuum: A deep vacuum is then pulled on the system for at least 30-45 minutes to remove any moisture, which can freeze and cause blockages or turn into corrosive acids.
3. Charging by Weight: The precise amount of R-1234yf is then weighed in. Do not use pressure gauge readings to determine the charge, as this is inaccurate and can lead to overcharging or undercharging.

Common A/C Problems for This Vehicle

While generally reliable, some common A/C issues on the Ram ProMaster include:

• Compressor Failures: The A/C compressor is the heart of the system. Failures can be catastrophic, spreading debris throughout the system and requiring a full system flush.
• Condenser Damage: Located at the front of the vehicle, the condenser is susceptible to damage from road debris. Even a small leak can lead to a loss of refrigerant.
• Evaporator Leaks: The evaporator core, located inside the dashboard, can develop leaks over time. This is a labor-intensive repair.

When to Call a Pro

While a confident DIYer might be tempted to tackle an A/C recharge, the high cost of R-1234yf and the specialized equipment required make this a job best left to a professional for most owners. If your ProMaster's A/C is not blowing cold, a certified technician can perform a leak test, diagnose the root cause of the problem, and perform the proper repair and recharge.

Safety Disclaimer: The EPA requires anyone servicing motor vehicle air conditioning systems to be certified under Section 609 of the Clean Air Act. Handling refrigerants without proper certification is illegal and can be dangerous.

Find a certified A/C shop on Repairius.