2018 International MV Coolant Capacity & Type

The 2018 International MV holds approximately 36-40 quarts (34-38 liters) of coolant in its cooling system, depending on the specific engine and additional cooling components.

Quick Answer

• Total Cooling System Capacity: 36-40 quarts (34-38 liters)
• OEM Coolant Spec: Red/Pink, OAT (Organic Acid Technology) based. Navistar MPAP (Material & Parts Application Process) Spec. CEMS-B0-006
• Mix Ratio: 50/50 Pre-mix or Concentrate mixed 50/50 with distilled water

Capacity by Engine Option

The International MV chassis in 2018 was typically equipped with the Cummins B6.7 or L9 engine. The overall cooling system capacity can vary slightly based on the specific engine, cab configuration, and any auxiliary cooling systems (e.g., for transmissions or hydraulic systems).

Flush Interval

The recommended coolant flush interval for a 2018 International MV largely depends on the type of coolant used and operating conditions.

• Normal Duty: Typically 6 years or 300,000 miles (480,000 km) for OAT coolants.
• Severe Duty: Consider shortening the interval to 3 years or 150,000 miles (240,000 km) if the vehicle operates under severe conditions such as extreme temperatures, heavy towing, frequent idling, or dusty environments. Always refer to the specific coolant manufacturer's recommendations and the International MV maintenance manual.

How to Refill & Bleed

Properly refilling and bleeding the cooling system on an International MV is crucial to prevent air pockets, which can lead to overheating.

1. Drain the System: With the engine cool, open the petcock on the bottom of the radiator and any engine block drain plugs to fully drain the old coolant. Collect all coolant in an appropriate container for disposal.
2. Flush (Optional but Recommended): If the old coolant was heavily contaminated or a different type is being used, flush the system with distilled water until the draining water runs clear. You can use a cooling system flush product if needed.
3. Close Drains: Ensure all drain plugs and the radiator petcock are securely closed.
4. Refill: Begin filling the cooling system slowly with the recommended 50/50 OAT coolant through the radiator fill neck or the surge tank.
5. Bleeding Procedure:
   • Start the engine and run it with the heater on full blast (this opens the heater core, allowing coolant to circulate through it).
   • Allow the engine to reach operating temperature. Monitor the temperature gauge closely.
   • As the engine warms up, the thermostat will open, and coolant will begin to circulate fully. The coolant level in the surge tank may drop, indicating air is escaping. Top off as needed.
   • Some International MV models may have a bleeder screw located on a hose or thermostat housing; refer to your service manual for exact locations. Open these carefully to release trapped air, then close once a steady stream of coolant emerges.
   • Squeeze the upper and lower radiator hoses several times to help dislodge air pockets.
   • Continue to run the engine for 15-20 minutes, periodically checking and topping off the coolant level in the surge tank.
6. Final Check: Once the engine is cool, recheck the coolant level in the surge tank and fill to the 'cold fill' line if necessary. Keep an eye on the coolant level over the next few drive cycles and top off as needed.

Common Cooling System Issues for this Generation

Owners and technicians of 2018 International MV trucks may encounter several common cooling system issues:

• Coolant Leaks: Due to vibrations and operating conditions, hoses, radiator seams, water pump seals, and EGR cooler components can develop leaks. Inspect regularly for signs of coolant loss or drips.
• EGR Cooler Failures: The Exhaust Gas Recirculation (EGR) cooler is a known potential failure point in many modern diesel engines. Internal leaks can introduce coolant into the exhaust or combustion chambers, leading to white smoke, coolant loss, and engine damage.
• Thermostat Issues: A stuck-open thermostat can lead to the engine running too cool, reducing efficiency, while a stuck-closed thermostat will cause rapid overheating.
• Radiator Clogging: Debris or internal corrosion can lead to radiator fins becoming clogged externally, or passages internally, reducing cooling efficiency. Using the correct coolant and maintaining proper flush intervals helps prevent internal corrosion.
• Water Pump Failures: The water pump circulates coolant, and its bearings or seals can eventually wear out, leading to leaks or reduced circulation.
• Degas Bottle/Surge Tank Cap Issues: A faulty pressure cap on the surge tank can lead to coolant loss due to improper pressure regulation or allow air into the system.

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