2019 Mercedes-Benz Metris Coolant Capacity & Type

The 2019 Mercedes-Benz Metris holds approximately 9.5 to 10.0 quarts (9.0 to 9.5 liters) of coolant in its cooling system.

Quick Answer

• Total Cooling System Capacity: 9.5 - 10.0 quarts (9.0 - 9.5 liters)
• OEM Coolant Spec: Mercedes-Benz Antifreeze/Coolant, MB 325.0 or 325.6 specification. This is a blue, silicate-containing hybrid organic acid technology (HOAT) coolant or a magenta, silicate-free organic acid technology (OAT) coolant, depending on the specific engine and model year. For the 2019 Metris, the blue MB 325.0 is commonly specified, though always confirm with your owner's manual.
• Mix Ratio: 50/50 Pre-mix (distilled water and coolant concentrate) is recommended for optimal performance and protection against freezing and corrosion.

Capacity by Engine Option

For the 2019 Mercedes-Benz Metris, typically equipped with the 2.0L M274 Inline-4 turbocharged engine, the cooling system capacity remains fairly consistent across the available configurations.

Flush Interval

Mercedes-Benz generally specifies a coolant flush interval that can vary based on the coolant type and driving conditions. For the blue MB 325.0 coolant, the typical recommendation is:

• Normal Duty: Every 10 years or 150,000 miles, whichever comes first.
• Severe Duty: If the vehicle is regularly exposed to extreme temperatures (very hot or very cold), heavy towing, or frequent stop-and-go city driving, it's advisable to inspect the coolant annually and consider a flush every 5 years or 75,000 miles.

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

How to Refill & Bleed

Properly refilling and bleeding the cooling system in your 2019 Mercedes-Benz Metris is crucial to prevent air pockets, which can lead to overheating. Here's a general procedure:

1. Preparation: Ensure the engine is completely cool. Park the vehicle on level ground. Open the hood and locate the coolant reservoir.
2. Drain (if flushing): If you are performing a full flush, drain the system by opening the drain plug on the radiator and, if applicable, on the engine block. Collect the old coolant in an appropriate container for disposal.
3. Flush (if desired): Flush the system with distilled water until clear, if performing a full coolant replacement. Close all drain plugs.
4. Refill: Slowly add the correct MB-approved 50/50 coolant mix to the expansion tank up to the "MAX" line. Pour slowly to allow air to escape.
5. Bleeding (Air Removal):
   • Leave the expansion tank cap off or slightly loose.
   • Start the engine and set the cabin heater to its highest temperature and fan speed (this opens the heater core valve to allow coolant to circulate through it).
   • Allow the engine to reach operating temperature. As the engine warms up, the thermostat will open, and coolant will begin to circulate. You may see the coolant level in the expansion tank drop; add more coolant mixture as needed to maintain the "MAX" level.
   • Gently squeeze the upper and lower radiator hoses several times to help dislodge any trapped air bubbles.
   • Monitor the temperature gauge to ensure over-heating does not occur. Look for bubbles rising in the expansion tank. Continue this process for 15-20 minutes, or until no more bubbles appear.
   • For the Metris, there typically isn't a specific bleed screw. The system is largely self-bleeding, but patience is key. Some technicians may use a vacuum-fill tool for a more thorough and faster bleed, particularly after a complete system drain.
6. Final Check: Once the engine is cool, recheck the coolant level in the expansion tank and top off to the "MAX" line if necessary. Replace the cap tightly. Drive the vehicle and recheck the level again after the first few trips.

Common Cooling System Issues

For the W447 generation Mercedes-Benz Metris (2016-present), owners might encounter some common cooling system issues, though overall it is a reliable system:

• Thermostat Housing Leaks: The plastic thermostat housing can be prone to cracking or developing leaks over time, often manifesting as a slow, consistent drip of coolant.
• Water Pump Failure: While not excessively common, like any mechanical pump, the water pump can eventually fail, leading to leaks or inefficient coolant circulation. Symptoms include puddles under the vehicle, an overheating engine, or a grinding noise from the pump pulley.
• Radiator Leaks: Road debris or age can cause the radiator fins and tubes to become damaged, leading to coolant leaks. These are usually visible as stains on the radiator itself or puddles beneath the front of the vehicle.
• Coolant Expansion Tank Leaks: The plastic expansion tank can develop hairline cracks, especially around hose connections or seams, leading to slow coolant loss.
• Heater Core Issues: Though less frequent, a clogged or leaking heater core can lead to poor cabin heating, a sweet smell inside the vehicle, or even fogging of the windows due to steam.
• Hose & Clamp Degradation: Over time, rubber hoses can harden, crack, or become soft, and hose clamps can lose their tension, leading to leaks. Regular inspection is recommended.

Regular maintenance and using the correct Mercedes-Benz approved coolant are essential to prevent many of these issues and ensure the longevity of your Metris's cooling system.

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