2019 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 for the 2019 International LT come from 3 brands — PRESTONE, VALVOLINE and PEAK. The "Popular" part is PRESTONE AF3100. Every part fits both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 1 option from PRESTONE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.

In the Heavy Duty grade, PRESTONE, VALVOLINE and PEAK supply 7 parts: rated for severe service. A representative part number is VALVOLINE ZXG051.

In the Premium grade, PRESTONE supplies 2 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, VALVOLINE supplies 1 part: built to original-equipment specification. A representative part number is VALVOLINE 861399.

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

2 Coolant Reservoir parts are listed for the 2019 International LT, from 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 are listed for the 2019 International LT, from GATES and MOTORAD. All of them fit every engine offered in the 2019 LT.

Listed part numbers: GATES 31405 and MOTORAD T39.

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

2 Cooling System Tester Adapter parts for the 2019 International LT come from GATES.

This group includes GATES 31379 and GATES 31410.

This table covers the Hose clamps. Read more

This group shows a single part: DORMAN 9044000.

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

This group shows a single part: GPD 2711621.

This table covers the Intercooler Air Hose pipes. Read more

4 Intercooler Air Hose / Pipe parts for the 2019 International LT come from 2 brands — CONTINENTAL and GATES. 2 parts fit every engine; the other 2 are engine-specific.

Part numbers include CONTINENTAL 57504, CONTINENTAL 57513 and GATES 26200, among others listed 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 for the 2019 International LT come from 3 brands — GPD, SPECTRA PREMIUM and OSC. The "Popular" part is SPECTRA PREMIUM 20013560P. 4 parts fit every engine; the other 2 are engine-specific.

The Economy section: 2 options from GPD. GPD 9282773 is listed in this group.

Standard Replacement: 4 parts, from SPECTRA PREMIUM and OSC. A representative part number is SPECTRA PREMIUM 20013560P.

This group includes SPECTRA PREMIUM 20013560P, GPD 9282773 and GPD 9282774 and the remaining parts 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 are listed for the 2019 International LT, from MOTORAD, CALORSTAT and GATES. GATES 34148 carries the "Popular" badge.

The Heavy Duty section: 1 option from GATES. GATES 34148 is listed in this group.

The Standard Replacement section: 7 options from MOTORAD and CALORSTAT. MOTORAD 406190 is listed in this group.

2 ungrouped parts are not assigned to a grade, 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

2 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2019 International LT come from DORMAN.

Listed part numbers: DORMAN 6745003G and DORMAN 6745008G.

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 are listed for the 2019 International LT, from US MOTOR WORKS, GMB, FVP and 2 other brands. US MOTOR WORKS US932 carries the "Popular" badge.

Economy: 3 parts, from FVP and US MOTOR WORKS. A representative part number is US MOTOR WORKS US932.

In the High Volume / Pressure grade, GATES supplies 1 part: grouped under the catalog's "High Volume / Pressure" designation — the notes column spells out what sets them apart. A representative part number is GATES 45071HD.

The Standard Replacement section: 3 options from GMB. GMB 1962230 is listed in this group.

5 ungrouped parts are not assigned to a grade, with the same engine-level match.