2016 Freightliner M2 106 Coolant Capacity & Type

The 2016 Freightliner M2 106 coolant capacity varies depending on the engine configuration, typically ranging from 30 to 50 quarts (28.4 to 47.3 liters).

Quick Answer

• Total Cooling System Capacity: 30-50 quarts (28.4-47.3 Liters)
• OEM Coolant Spec: Detroit Diesel Power Cool Plus (Organic Acid Technology - OAT), typically purple/pink.
• Mix Ratio: 50/50 pre-mix, or 50/50 concentrate with deionized water.

Capacity by Engine Option

The Freightliner M2 106 in 2016 was available with several engine options, primarily from Detroit Diesel and Cummins. Coolant capacity can vary significantly between these engines.

Always consult your vehicle's owner's manual or the engine manufacturer's specifications for the precise capacity for your specific engine configuration.

Flush Interval

The flush interval for your 2016 Freightliner M2 106 depends on the coolant type used and operating conditions.

• Normal Duty: Typically, Detroit Diesel Power Cool Plus OAT coolant is designed for extended service intervals, often up to 5 years or 250,000 miles (400,000 km), whichever comes first.
• Severe Duty (heavy hauling, frequent idling, extreme temperatures): It is recommended to perform a flush and fill more frequently, possibly every 3 years or 150,000 miles (240,000 km), or even sooner based on coolant testing results.

Regularly check your coolant's condition with test strips to monitor its health and additive levels.

How to Refill & Bleed

Properly refilling and bleeding the cooling system of a Freightliner M2 106 is critical to prevent air pockets, which can lead to overheating and engine damage.

1. Safety First: Ensure the engine is cool and the truck is on a level surface. Wear appropriate personal protective equipment.
2. Drain the System: Open the radiator drain cock and any engine block drain plugs to thoroughly drain the old coolant. Flush with distilled water until clear, if performing a full flush.
3. Close Drains: Securely close all drain points.
4. Refill: Begin filling the system slowly with the specified 50/50 coolant mix through the surge tank/expansion tank.
5. Start Engine & Bleed: With the heater on full hot (fan speed low), start the engine and let it reach operating temperature. As the engine warms, air will be purged from the system. Some M2 106 models, particularly those with certain engine configurations, may have a bleed screw or valve on the thermostat housing or radiator hose—open this slightly until a steady stream of coolant emerges, then close.
6. Maintain Level: Continuously monitor the coolant level in the surge tank and top off as needed. Squeeze the upper and lower radiator hoses to help dislodge air bubbles.
7. Test Drive & Recheck: After a test drive, allow the engine to cool completely and recheck the coolant level, topping off if necessary. Repeat this process over a few drive cycles to ensure all air is expelled.

Hint: Some professional shops use a vacuum-fill tool to quickly and thoroughly remove air while refilling, which is highly recommended for commercial vehicles.

Common Cooling System Issues

Owners of 2016 Freightliner M2 106 trucks may encounter several common cooling system issues typical for commercial vehicles of this age and usage:

• Radiator Leaks: Due to road debris, vibration, or age, radiators can develop leaks. Inspect fins for damage and connections for drips.
• Hose Failures: Coolant hoses can crack, swell, or become brittle over time, leading to leaks. Pay attention to the upper and lower radiator hoses, and heater hoses.
• Water Pump Failure: The water pump