2023 Volvo VNL Coolant Capacity & Type

The 2023 Volvo VNL holds between 40 to 60 quarts (37.85 to 56.78 Liters) of coolant, depending on the engine and configuration.

Quick Answer

• Total Cooling System Capacity: 40-60 quarts (37.85-56.78 Liters)
• OEM Coolant Spec: Volvo VCS-2 (Yellow/Orange, Nitrite-Free Organic Acid Technology - OAT)
• Mix Ratio: 50/50 Pre-mix or 50/50 concentrate with distilled water

Capacity by Engine Option

The Volvo VNL offers various engine options, and coolant capacity can vary. Always consult your owner's manual or the engine manufacturer's specifications for the precise capacity for your particular engine.

Flush Interval

Maintaining your coolant is crucial for the longevity of your engine. Volvo recommends the following flush intervals for the 2023 VNL:

• Normal Duty: Every 4 years or 400,000 miles (640,000 km), whichever comes first.
• Severe Duty: Every 3 years or 300,000 miles (480,000 km), whichever comes first. Severe duty includes conditions such as heavy hauling, extreme temperatures, or frequent idling.

Always use Volvo VCS-2 approved coolant to ensure these intervals can be met and to protect your cooling system components.

How to Refill & Bleed

Properly refilling and bleeding your Volvo VNL's cooling system is essential to prevent air pockets, which can lead to overheating. While specific steps may vary slightly based on engine configuration, the general procedure is as follows:

1. Safety First: Ensure the engine is cool before starting. Wear appropriate personal protective equipment (PPE) like gloves and eye protection.
2. Drain the System: Open the radiator drain petcock and any engine block drain plugs to thoroughly drain the old coolant. Collect all coolant in an appropriate container for recycling.
3. Flush (Optional but Recommended): If performing a flush, use distilled water or a reputable cooling system cleaner as per product instructions. Rinse until the water runs clear.
4. Close Drains: Close all drain plugs and the radiator petcock.
5. Refill: Begin filling the system with the recommended 50/50 mix of Volvo VCS-2 coolant through the expansion tank. Fill slowly to help minimize air entrapment.
6. Start Engine & Bleed: Start the engine and set the cabin heater to its highest setting (fan speed low). Allow the engine to reach operating temperature. As the engine warms, the thermostat will open, and coolant will circulate. Continue to monitor the coolant level in the expansion tank and top off as needed. Squeeze the upper and lower radiator hoses gently to help dislodge any trapped air.
7. Check for Bleed Screws: Some Volvo VNL engines, particularly those with complex routing, may have specific bleed screws or valves designed to release trapped air. Consult your service manual for their locations and proper usage.
8. Vacuum Fill (Professional Recommendation): For the most effective air removal, particularly in large commercial vehicle cooling systems, a vacuum-fill tool is highly recommended. This tool creates a vacuum in the system, pulls out all air, and then draws in the new coolant without introducing air pockets.
9. Final Check: Once the engine is at operating temperature and the fan has cycled a few times, shut off the engine and let it cool completely. Recheck the coolant level in the expansion tank and adjust if necessary. Monitor the level over the next few driving cycles.

Common Cooling System Issues

While the Volvo VNL is a robust truck, certain cooling system issues can arise, especially with improper maintenance:

• Coolant Leaks: Due to the extensive plumbing and connections in a commercial truck, leaks can occur from hoses, radiator, water pump, or heater core. Regularly inspect for drips or puddles.
• EGR Cooler Failure: On diesel engines, the Exhaust Gas Recirculation (EGR) cooler can develop internal leaks, leading to coolant loss or contamination with exhaust gases.
• Thermostat Malfunction: A faulty thermostat can cause the engine to run too hot or too cold, impacting efficiency and potentially leading to damage.
• Radiator Clogging: Debris, corrosion, or mixing incompatible coolants can lead to blockages in the radiator, reducing its cooling efficiency.
• Water Pump Failure: The water pump is a critical component that circulates coolant. Bearing failure or leaks can lead to overheating.
• Expansion Tank Cap Issues: A faulty pressure cap on the expansion tank can lead to coolant loss or an inability to maintain proper system pressure.

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