2016 Kenworth W900 Coolant Capacity & Type

The 2016 Kenworth W900 has a total cooling system capacity that typically ranges from 40 to 52 quarts (37.8 to 49.2 liters), depending on the specific engine and radiator configuration.

Quick Answer

• Total Cooling System Capacity: 40-52 quarts (37.8 - 49.2 Liters) for models with PACCAR MX-13 or Cummins ISX engines.
• OEM Coolant Specification: Extended Life Coolant (ELC) that is Nitrite-Free and meets TMC RP-329 or RP-338 specifications. Often red or pink in color.
• OEM Manufacturer Spec: PACCAR ELC (Extended Life Coolant) or equivalent, such as Cummins CES 14603.
• Mix Ratio: 50/50 mix of distilled water and coolant concentrate, or a pre-diluted 50/50 premix.

Capacity by Engine Option

Note: Capacities are approximate and can vary based on radiator size, presence of auxiliary heaters, and other optional equipment. Always confirm with your vehicle's documentation.

Flush Interval

• Normal Duty: The initial factory fill of PACCAR ELC is designed for a long life. The recommended service interval is typically 600,000 miles (965,000 km) or 12,000 hours. After the initial flush, subsequent intervals may be shorter.
• Severe Duty: For vehicles operating in severe conditions (heavy loads, extreme temperatures, high idle time), it is recommended to test the coolant annually and adhere to a more frequent flush interval, potentially as low as 300,000 miles (480,000 km).

How to Refill & Bleed

Refilling a heavy-duty cooling system requires care to avoid air pockets, which can cause overheating.

1. Ensure the engine is cool before opening the pressure cap on the surge tank (expansion tank).
2. Slowly add the 50/50 coolant mixture into the surge tank until it reaches the "MAX COLD" line.
3. Start the engine with the heater set to the highest temperature and the fan on a low setting. This ensures coolant circulates through the heater core.
4. As the engine warms up, the coolant level will drop as air is purged. Continue to top off the surge tank, keeping the level between the "MIN" and "MAX" marks.
5. Some models may have a bleed valve on the engine or radiator to help release trapped air. Check the engine-specific service manual for its location and procedure.
6. Once the engine reaches operating temperature (the thermostat opens), and the level in the surge tank stabilizes, reinstall the pressure cap.
7. Vacuum-filling is the professional-preferred method for these large systems to prevent airlocks.

Common Cooling System Issues

The 2016 Kenworth W900 is a robust truck, but like any heavy-duty vehicle, it can experience cooling system problems.

• EGR Cooler Failure: A common issue on many diesel engines of this era. A failing EGR cooler can leak coolant into the exhaust or intake, leading to white smoke, coolant loss, and potential engine damage.
• Radiator Leaks: Due to vibration and exposure, the seams and core of the large radiator can develop leaks over time.
• Surge Tank (Expansion Tank) Cracks: The plastic surge tank can become brittle with age and heat cycles, leading to cracks and coolant leaks.
• Fan Clutch Issues: A malfunctioning fan clutch can fail to engage the engine-driven fan, leading to overheating, especially under load or at low speeds.

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