2021 Mercedes-Benz Sprinter Coolant Capacity & Type

The 2021 Mercedes-Benz Sprinter typically holds between 10.5 to 11.6 quarts (9.9 to 11.0 liters) of coolant, depending on the engine and specific configuration.

Quick Answer

• Total Cooling System Capacity: 10.5 - 11.6 quarts (9.9 - 11.0 liters)
• OEM Coolant Spec: Mercedes-Benz Specification 325.0, 325.5, or 326.0 (Phosphate-free, Silicate HOAT or OAT, Blue or Pink/Purple)
• Mix Ratio: 50/50 Pre-mixed or concentrate to be mixed with distilled water

Capacity by Engine Option

For the 2021 Mercedes-Benz Sprinter, the coolant capacity can vary slightly depending on the engine and chassis configuration. The common engine options include:

• 2.0L 4-Cylinder Turbo Diesel (OM651): Approximately 10.5 quarts (9.9 liters)
• 3.0L V6 Turbo Diesel (OM642): Approximately 11.6 quarts (11.0 liters)
• 2.0L 4-Cylinder Turbo Gasoline (M274): Approximately 10.5 quarts (9.9 liters)

These figures are approximations and can vary slightly based on specific vehicle options (e.g., auxiliary heaters) and manufacturing tolerances. Always refer to your owner's manual for the most accurate information for your specific vehicle.

Flush Interval

Maintaining your Sprinter's cooling system is crucial for its longevity and performance. The recommended flush interval varies:

• Normal Duty: Mercedes-Benz generally recommends a coolant flush and replacement every 150,000 miles or 15 years, whichever comes first.
• Severe Duty: If your Sprinter is operated under severe conditions (e.g., frequent towing, extreme temperatures, dusty environments, or heavy commercial use), it's wise to consider flushing the coolant more frequently, possibly every 75,000 miles or 7 years.

Always adhere to the maintenance schedule outlined in your owner's manual.

How to Refill & Bleed

Refilling and bleeding the cooling system on a 2021 Mercedes-Benz Sprinter requires careful attention to detail. Here's a general procedure, but always consult your service manual for precise steps:

1. Drain the System: Ensure the engine is cool. Place a drain pan under the radiator drain plug and open it. Open the bleed screws (if present) and remove the radiator cap to allow for full drainage.
2. Close Drain and Refill: Once drained, close the radiator drain plug. Begin refilling the system slowly with the specified Mercedes-Benz approved coolant (50/50 mix with distilled water if using concentrate) through the expansion tank.
3. Bleed the System: This is a critical step for modern Mercedes-Benz vehicles. Many Sprinters use a self-bleeding system, but it's essential to assist the process:
   • Leave the expansion tank cap off.
   • Start the engine and let it run with the heater on full blast (lowest fan speed) to open the heater core thermostat.
   • Monitor the coolant level in the expansion tank and top it off as needed as air escapes. Gently squeeze the upper and lower radiator hoses to help dislodge air bubbles.
   • Some Sprinter models may have specific bleed screws on the radiator or heater hoses; open these incrementally until a steady stream of coolant (without air bubbles) emerges, then close them.
   • Vacuum Fill: For the most thorough bleed and to prevent air pockets, a professional vacuum fill tool is highly recommended, especially after a major component replacement (e.g., radiator, water pump).
4. Final Check: Once the engine reaches operating temperature and the thermostat opens (you'll feel the upper radiator hose get hot), continue to monitor for air bubbles. Once no more air escapes, replace the expansion tank cap. Allow the engine to cool completely and recheck the coolant level, topping off if necessary.

Common Cooling System Issues

While robust, the cooling system in the 2021 Mercedes-Benz Sprinter can experience some common issues:

• Thermostat Housing Leaks: The plastic thermostat housing can become brittle over time and develop leaks. This is more prevalent in older models but can occur.
• Water Pump Failures: The water pump, especially in higher mileage vehicles, can develop leaks or bearing noise, necessitating replacement.
• EGR Cooler Leaks (Diesel Engines): The Exhaust Gas Recirculation (EGR) cooler in diesel engines can be a source of coolant leaks, which require specialized attention.
• Radiator Leaks: Radiators can develop leaks from stone chips, corrosion, or plastic end tank failures.
• Coolant Level Sensor Issues: A faulty coolant level sensor in the expansion tank can trigger false warning lights on the dashboard.
• Hose & Clamp Degradation: Over time, rubber hoses can harden, crack, or soften, and clamps can lose their tension, leading to leaks.

Regular inspection and adherence to the recommended maintenance schedule can help mitigate these issues. Using only approved Mercedes-Benz coolant is paramount to prevent material degradation and ensure system compatibility.

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