2022 International MV Coolant Capacity & Type Guide

The 2022 International MV holds approximately 25 to 35 quarts (23.6 to 33.1 liters) of coolant, depending on the specific engine option, cab configuration, and factory cooling package installed. As an ASE-certified master technician, I regularly service medium-duty trucks like the International MV series, and proper cooling system maintenance is absolutely critical for the longevity of the Cummins powerplants found under the hood.

Below is everything you need to know about the coolant capacity, specifications, and service procedures for your 2022 International MV.

Quick answer

• Total Cooling System Capacity: 25.0 – 35.0 quarts (23.6 – 33.1 liters), varying by radiator package and auxiliary heater options.
• OEM Coolant Spec: Heavy-Duty Extended Life Coolant (HD ELC) Nitrite-Free OAT (Organic Acid Technology). It is typically Red or Magenta in color and must meet the Cummins CES 14603 specification (such as Fleetguard ES Compleat OAT).
• Mix Ratio: 50/50 pre-mixed coolant and distilled water (yields freeze protection down to -34°F).

Capacity by engine option

The 2022 International MV is primarily equipped with reliable Cummins diesel engines. Because these trucks are highly customizable for different vocational bodies, the cooling package sizes vary.

Note: Trucks equipped with auxiliary cab heaters, PTO-driven equipment coolers, or heavy-duty transmission coolers may require up to 2-3 additional quarts. Always verify the level at the surge tank.

Flush interval

The use of OAT heavy-duty coolant allows for highly extended service intervals, provided the system is maintained properly and not contaminated with standard IAT (green) coolant.

• Normal Duty: Replace coolant every 600,000 miles, 12,000 operating hours, or 6 years (whichever comes first).
• Severe Duty (High Idle / Vocational): Check coolant condition, freeze point, and inhibitor levels using test strips at every preventative maintenance (PM) interval. A full flush is recommended at 300,000 miles, 6,000 hours, or 3 years if inhibitor levels drop below specification.

How to refill & bleed

Modern heavy-duty diesel engines with complex EGR coolers and expansive heater circuits are notorious for trapping air.

1. Drain the system: Open the radiator petcock and remove the lower radiator hose if a complete drain is required.
2. Use a Vacuum Fill Tool (Highly Recommended): To prevent air pockets—which can instantly boil the coolant inside a Cummins EGR cooler and cause it to rupture—always use a pneumatic vacuum cooling system filler.
3. Draw a Vacuum: Connect the tool to the surge tank, draw a vacuum of at least 25 inHg, and verify it holds to ensure there are no leaks.
4. Refill: Allow the vacuum to pull the pre-mixed 50/50 HD ELC OAT coolant into the system.
5. Final Bleed: Start the engine and turn the cab heater on maximum heat. Let the truck reach operating temperature (around 185°F - 195°F) so the thermostat opens. Monitor the surge tank level and add coolant to the "MAX/COLD" line once the engine cools back down.

Common cooling system issues

For the 2022 generation of the International MV (and its Cummins engines), keep an eye out for a few specific issues:

• EGR Cooler Leaks: While improved over older generations, the Cummins B6.7 and L9 can still suffer from internal EGR cooler leaks if the system runs low on coolant or has trapped air. Unexplained coolant loss with no external leak is a primary symptom.
• Water Pump Weepage: A small amount of weeping from the water pump weep hole is normal upon startup, but continuous dripping means the mechanical seal has failed.
• Hose Chafing: Due to the severe vibration inherent in vocational trucks, always inspect the lower radiator hoses and heater core lines for chafing against the frame rails or steering components.

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