2018 Mercedes-Benz Sprinter A/C Refrigerant & Oil Capacity Guide

Quick Answer

• Refrigerant Type: R-1234yf
• Full System Charge: 22.9 oz (650 grams)
• PAG Oil Type: PAG 46
• PAG Oil Amount: 4.7 oz (140 mL)
• Low-Side Service Port Location: Typically on the accumulator/drier, located on the passenger side near the firewall.
• High-Side Service Port Location: Usually on a line coming off the condenser, often near the front of the vehicle on the passenger side.

Why R-1234yf Matters

For your 2018 Mercedes-Benz Sprinter, the A/C system uses R-1234yf refrigerant. This is a significant change from the older R-134a refrigerant, primarily driven by environmental regulations. The European Union mandated a transition to refrigerants with a lower Global Warming Potential (GWP) starting in 2011 for new vehicle types and 2017 for all new vehicles. R-1234yf has a GWP significantly lower than R-134a, making it a more environmentally friendly choice.

This transition impacts several aspects for vehicle owners and technicians:

• Cost: R-1234yf coolant is generally more expensive than R-134a, which can lead to higher repair costs when your system needs a recharge or repair.
• EPA Regulations: The U.S. Environmental Protection Agency (EPA) also encourages the use of low-GWP refrigerants. Proper handling and recovery of R-1234yf are crucial and mandated by EPA Section 609, just like R-134a.
• Recovery Machine Requirements: Due to its flammability characteristics (though mild), R-1234yf requires specialized recovery, recycling, and recharging equipment. This means not all shops are equipped to service R-1234yf systems, and home DIY solutions are strongly discouraged.

Recharge Procedure

Recharging your Sprinter's A/C system is not as simple as just adding a can of refrigerant. It's a precise process that requires specialized tools and knowledge. Here's a high-level overview of the correct procedure:

1. Evacuation: The system must first be evacuated using a vacuum pump. This process removes air and moisture from the A/C system, which can cause significant damage and reduce efficiency if left in. A deep vacuum is critical for proper operation.
2. Leak Test: After evacuation, the system should hold a vacuum for a specified period, indicating no leaks. If a leak is present, it must be located and repaired before proceeding.
3. Proper Charge by Weight: The most critical step is charging the system with the exact amount of refrigerant by weight, not by pressure. Your 2018 Sprinter requires 22.9 ounces (650 grams) of R-1234yf. Overcharging or undercharging can lead to poor cooling performance, increased fuel consumption, and potential damage to the compressor. Using an A/C charging machine that weighs the refrigerant is essential.
4. PAG Oil: If components were replaced or the system was opened, the correct type and amount of PAG (Polyalkylene Glycol) oil must be added. For your Sprinter, it's PAG 46, and the total system capacity is 4.7 oz (140 mL). Be sure to consult official service information for specific component oil charge amounts.

Never rely solely on pressure readings from gauges to determine a proper charge. Pressure varies significantly with ambient temperature and humidity, making it an unreliable indicator of refrigerant quantity.

Common A/C Problems for This Vehicle

While the Mercedes-Benz Sprinter is a robust vehicle, like any A/C system, it can develop issues. Some common problems observed for this generation might include:

• Compressor Failures: The A/C compressor is the heart of the system. Failures can result from insufficient lubrication (low oil), contamination, or simply wear and tear. Symptoms include a loud grinding noise, lack of cooling, 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 refrigerant leaks. Reduced cooling efficiency can also be a symptom of a dirty or obstructed condenser.
• Evaporator Leaks: The evaporator is located inside the vehicle's dashboard. Leaks here are more challenging to diagnose and repair, often requiring significant dashboard disassembly. A musty odor in the cabin and refrigerant disappearing over time are common signs.
• Electrical Problems: Sprinters, with their complex electrical systems, can experience issues with A/C control modules, relays, or pressure sensors, leading to intermittent or complete A/C failure.

When to Call a Pro

Given the complexity of R-1233yf systems, the potential for harm if mishandled, and the need for specialized equipment, it is always recommended to seek a professional for any A/C system repairs or recharges. Attempting to service an R-1234yf system without proper training and equipment can lead to:

• Personal Injury: Refrigerant can cause frostbite, and incorrect handling can lead to other hazards.
• System Damage: Improper charging or contamination can severely damage expensive A/C components.
• Environmental Harm: Releasing refrigerant into the atmosphere is illegal and harmful to the environment.

An EPA Section 609 certified technician has the knowledge and tools to correctly diagnose, repair, and recharge your 2018 Mercedes-Benz Sprinter's A/C system while adhering to all environmental regulations.

Find a certified A/C shop on Repairius.