2018 Mercedes-Benz Metris Coolant Capacity & Type

The 2018 Mercedes-Benz Metris holds approximately 10.6 quarts (10.0 liters) of coolant.

Quick Answer

• Total Cooling System Capacity: 10.6 quarts (10.0 liters)
• OEM Coolant Spec: Mercedes-Benz Antifreeze/Coolant, MB 325.0, MB 325.6, or MB 326.0 (blue/green, Silicated HOAT or Hybrid OAT)
• Mix Ratio: 50/50 Prediluted or concentrate to be mixed with distilled water

Capacity by Engine Option

The 2018 Mercedes-Benz Metris was typically equipped with a 2.0L M274 inline-4 turbocharged engine. The cooling system capacity for this engine is as follows:

Flush Interval

Mercedes-Benz recommends a coolant flush interval for the 2018 Metris as follows:

• Normal Duty: Every 10 years or 150,000 miles, whichever comes first.
• Severe Duty (e.g., heavy towing, extreme temperatures): It is advisable to inspect the coolant annually and consider flushing more frequently, potentially every 5 years or 75,000 miles.

Always refer to your vehicle's owner's manual for the most accurate and up-to-date maintenance schedules.

How to Refill & Bleed

Refilling and bleeding the cooling system on your 2018 Mercedes-Benz Metris requires care to ensure no air pockets remain, which can lead to overheating. Here are the general steps:

1. Preparation: Ensure the engine is cool. Position the vehicle on a level surface. Wear appropriate safety gear (gloves, eye protection).
2. Drain (if flushing): Open the drain plug on the radiator and/or engine block (if applicable) and remove the radiator cap to allow the old coolant to drain completely. Collect the old coolant in a suitable container for proper disposal.
3. Flush (if necessary): If flushing, close the drain plugs and fill the system with distilled water. Run the engine with the heater on high until it reaches operating temperature. Drain the water, then repeat until the water runs clear.
4. Refill: Close all drain plugs. Slowly pour new Mercedes-Benz approved 50/50 pre-diluted coolant (or concentrate mixed with distilled water) into the coolant reservoir up to the "MAX" mark. Do not overfill.
5. Bleeding Procedure:
   • Start the engine and let it run with the heater on full blast and the fan on low. This helps open the heater core valve and allows coolant to circulate through the entire system.
   • Keep the coolant reservoir cap off (or loosely fitted) and watch for bubbles. As the engine warms up, air pockets will rise to the surface and escape. Gently squeeze the upper and lower radiator hoses several times to help dislodge trapped air.
   • Maintain the coolant level in the reservoir by adding more as needed. Some Metris models may have a small bleed screw on a hose or the thermostat housing; if present, open it slightly until a steady stream of coolant emerges, then close it.
   • Continue this process until no more bubbles appear and the engine reaches its normal operating temperature. The fan should cycle on and off.
6. Final Check: Once the engine is cool, recheck the coolant level in the reservoir and top off if necessary. Monitor the coolant level over the next few drives.

Common Cooling System Issues for this Generation (W447 Metris)

Owners of the Mercedes-Benz Metris (W447 generation, 2016-present) may encounter several cooling system-related issues:

• Thermostat Housing Leaks: The thermostat housing, often made of plastic, can be prone to cracking or developing leaks over time, leading to a loss of coolant.
• Water Pump Leaks: While not exclusively to the Metris, water pump seals can eventually wear out, causing coolant to leak from the pump itself. Pay attention to any puddles under the front of the vehicle.
• Auxiliary Water Pump Failure: Some Mercedes-Benz models use an auxiliary electric water pump, often for the turbocharger or heater circuit. Failure of this pump can lead to specific cooling issues or reduced heating performance.
• Coolant Reservoir Cracks: The plastic coolant reservoir can develop hairline cracks, especially with age and exposure to temperature fluctuations, resulting in slow coolant loss.
• Radiator Leaks: Radiators can develop leaks from stone chips, corrosion, or weakened seams. White or colored residue around the radiator fins can indicate a leak.
• Hose Leaks: Rubber hoses can degrade, crack, or clamps can loosen, leading to coolant leaks. Regularly inspect hoses for bulges, cracks, or softness.

Always address any cooling system warnings or leaks promptly to prevent engine damage.

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