2017 Volvo VNL Coolant Capacity & Type

The 2017 Volvo VNL holds between 40 to 60 quarts (37.8 to 56.8 Liters) of coolant, depending on the engine and specific cooling system configuration.

Quick answer

• Total Cooling System Capacity: 40-60 quarts (37.8-56.8 Liters)
• OEM Coolant Spec: Volvo VCS-2 (Yellow, OAT or Hybrid OAT) or Volvo VCS (Blue, OAT or Hybrid OAT)
• Mix Ratio: 50/50 Pre-mix or 50/50 concentrate with deionized water

Capacity by engine option

The 2017 Volvo VNL was available with several engine options, and the coolant capacity can vary. Always consult your owner's manual for the precise capacity for your specific engine and configuration.

Flush interval

• Normal Duty: Typically 300,000 miles or 3 years, whichever comes first.
• Severe Duty (heavy hauling, extreme temperatures, frequent idling): Consider flushing at 150,000 miles or 1.5 years, whichever comes first. Always refer to the maintenance schedule in your owner's manual for definitive recommendations.

How to refill & bleed

Refilling and bleeding the cooling system on a Volvo VNL is crucial to prevent air pockets, which can lead to overheating. Always perform this procedure on a cool engine.

1. Drain the old coolant: Ensure the engine is cool. Open the petcock on the bottom of the radiator and any drain plugs on the engine block. Collect used coolant in a suitable container for proper disposal.
2. Flush (optional but recommended): If changing coolant types or if the old coolant was heavily contaminated, flush the system with distilled water until clear. You can use a dedicated flushing chemical, following its instructions.
3. Close drain points: Ensure all drains are securely closed.
4. Refill with new coolant: Slowly fill the degas bottle (coolant reservoir) with the specified Volvo VCS-2 coolant (yellow) or VCS coolant (blue) at a 50/50 mix ratio. Fill slowly to allow air to escape.
5. Bleeding process:
   • Leave the degas bottle cap off or loose.
   • Start the engine and run it with the heater on high (fan speed low) to open the heater core valve.
   • Allow the engine to reach operating temperature. As the thermostat opens, coolant will circulate, and air will be purged.
   • Monitor the coolant level in the degas bottle and top off as needed. You may see air bubbles rising.
   • Some Volvo VNL models may have a bleeder screw on a hose or near the thermostat housing. If present, open it carefully to release trapped air until a steady stream of coolant emerges. Close it immediately.
   • After running for several minutes at operating temperature, shut off the engine and let it cool completely.
   • Once cool, recheck the coolant level in the degas bottle and top off to the "COLD" mark. Install the cap securely.
   • Drive the vehicle and monitor the temperature gauge. Recheck the coolant level after the first few drive cycles and add as necessary.

Common cooling system issues

Owners of the 2017 Volvo VNL, like other heavy-duty trucks, can experience various cooling system issues. Prompt diagnosis and repair are key to preventing costly engine damage.

• Coolant Leaks: Hoses, radiator, water pump seals, and EGR cooler can develop leaks over time due to vibration, age, and temperature cycling. Check for puddles, low coolant levels, and visible drips.
• EGR Cooler Failure: The Exhaust Gas Recirculation (EGR) cooler is a common failure point in diesel engines. A failed EGR cooler can leak coolant into the exhaust or combustion chambers, leading to white smoke from the exhaust, coolant loss, and even hydrostatic lock.
• Radiator Clogging: Debris (leaves, dirt) accumulating between the radiator and charge air cooler (CAC) can restrict airflow, leading to overheating. Internal clogging from neglected coolant changes can also occur.
• Thermostat Failure: A stuck-open thermostat can cause the engine to run too cool, reducing fuel efficiency. A stuck-closed thermostat will lead to rapid overheating.
• Water Pump Failure: Symptoms include coolant leaks from the weep hole, whining noises, and engine overheating due to lack of coolant circulation.
• Degas Bottle/Reservoir Cracks: The plastic degas bottle can crack or become brittle over time, leading to slow coolant leaks.

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