2018 International LT Cooling System Parts

This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator. Read more

12 Coolant / Antifreeze parts are listed for the 2018 International LT, from PRESTONE, VALVOLINE and PEAK. PRESTONE AF3100 carries the "Popular" badge. 10 parts fit every engine; the other 2 are engine-specific.

The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.

In the Economy grade, PRESTONE supplies 1 part: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

The Heavy Duty section lists 7 options from PRESTONE, VALVOLINE and PEAK — rated for severe service. VALVOLINE ZXG051 is listed in this group.

The Premium section lists 2 options from PRESTONE — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 1 option from VALVOLINE — built to original-equipment specification. VALVOLINE 861399 is listed in this group.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

2 Coolant Reservoir parts for the 2018 International LT come from 2 brands — DORMAN and GPD.

This group includes DORMAN 6035124 and GPD 2421012.

This table covers the caps on the overflow / expansion tank. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

2 Coolant Reservoir Cap parts for the 2018 International LT come from 2 brands — GATES and MOTORAD. Every part fits both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged.

Part numbers include GATES 31405 and MOTORAD T39.

This table covers the adapters used to pressure-test this cooling system. Read more

GATES supplies both parts for the 2018 International LT.

This group includes GATES 31379 and GATES 31410.

This table covers the Hose clamps. Read more

One part is listed for the 2018 International LT — DORMAN 9044000.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

One part is listed for the 2018 International LT — GPD 2711621.

This table covers the Intercooler Air Hose pipes. Read more

4 Intercooler Air Hose / Pipe parts are listed for the 2018 International LT, from CONTINENTAL and GATES. 2 parts fit every engine; the other 2 are engine-specific.

Listed part numbers: CONTINENTAL 57504, CONTINENTAL 57513 and GATES 26200, plus the other parts above.

This table covers the radiators that dump engine heat to airflow through the core. Typical signs include overheating in traffic, a wet core, or coolant that disappears with no puddle. Replace the cap if it cannot hold the rated pressure, and bleed the system after the swap. Read more

6 Radiator parts are listed for the 2018 International LT, from GPD, SPECTRA PREMIUM and OSC. SPECTRA PREMIUM 20013560P carries the "Popular" badge. 4 parts fit every engine; the other 2 are engine-specific.

Economy: 2 parts, from GPD. A representative part number is GPD 9282773.

The Standard Replacement section: 4 options from SPECTRA PREMIUM and OSC. SPECTRA PREMIUM 20013560P is listed in this group.

Part numbers include SPECTRA PREMIUM 20013560P, GPD 9282773 and GPD 9282774, among others listed above.

This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part. Read more

10 Thermostat parts for the 2018 International LT come from 3 brands — MOTORAD, CALORSTAT and GATES. The "Popular" part is GATES 34148.

Heavy Duty: 1 part, from GATES. A representative part number is GATES 34148.

Standard Replacement: 7 parts, from MOTORAD and CALORSTAT. A representative part number is MOTORAD 406190.

2 further parts sit outside the graded sections, with the same engine-level match.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

DAYTON supplies both parts for the 2018 International LT.

Part numbers include DAYTON 6745008G and DAYTON 6745003G.

This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off. Read more

12 Water Pump parts for the 2018 International LT come from 5 brands — US MOTOR WORKS, GMB, FVP and 2 other brands. The "Popular" part is US MOTOR WORKS US932.

The Economy section: 3 options from FVP and US MOTOR WORKS. US MOTOR WORKS US932 is listed in this group.

The High Volume / Pressure section lists 1 option from GATES — grouped under the catalog's "High Volume / Pressure" designation — the notes column spells out what sets them apart. GATES 45071HD is listed in this group.

Standard Replacement: 3 parts, from GMB. A representative part number is GMB 1962230.

5 further parts sit outside the graded sections, with the same engine-level match.