19 Cooling system parts are listed for the 2025 International LT, in 8 part types, covering all 3 engine options (12.4L L6 DIESEL Turbocharged, 12.7L L6 DIESEL Turbocharged and 14.9L L6 DIESEL Turbocharged). Each one has a brand, a manufacturer part number and notes that say where it fits.
The cooling system system on the 2025 International LT keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Coolant / Antifreeze (4 parts), Intercooler Air Hose / Pipe (4 parts) and Radiator (4 parts). The other 5 part types cover the remaining 7 parts.
The 2025 International LT was sold with 3 engines. 10 parts fit every engine; the other 9 are engine-specific. Each part shows which engine(s) it fits.
6 brands supply cooling system parts for the 2025 International LT, led by GATES (6 parts), GPD (5 parts) and PRESTONE (4 parts), plus 3 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2025 International LT opens a page with every vehicle that part fits.
Coolant / Antifreeze
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: all 2025 LT engines | AFC10000 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Command ESi PrechargedPurple | View on Amazon |
| PRESTONE Fits: all 2025 LT engines | AFC12100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
| PRESTONE Fits: all 2025 LT engines | 115CEL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Celsius Extended Life Antifreeze or Command ESi Precharged Can1 Gallon | View on Amazon |
| PRESTONE Fits: all 2025 LT engines | 78065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Heavy Duty | View on Amazon |
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.
PRESTONE supplies the 4 Coolant / Antifreeze parts for the 2025 International LT. All of them fit every engine offered in the 2025 LT.
This group includes PRESTONE AFC10000, PRESTONE AFC12100 and PRESTONE 115CEL and the remaining parts above.
Coolant Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HASTINGS / BALDWIN Fits: 14.9L L6 DIESEL Turbocharged | LOPRI | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Coolant filters. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
One part is listed for the 2025 International LT — HASTINGS / BALDWIN LOPRI.
Coolant Reservoir
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2025 LT engines | 6035247 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GPD Fits: 12.4L L6 DIESEL Turbocharged, 12.7L L6 DIESEL Turbocharged | 2421013 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GPD Fits: 14.9L L6 DIESEL Turbocharged | 2421012 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the overflow / expansion tanks that hold extra coolant.
3 Coolant Reservoir parts for the 2025 International LT come from 2 brands — GPD and DORMAN. 1 part fits every engine; the other 2 are engine-specific.
This group includes DORMAN 6035247, GPD 2421013 and GPD 2421012.
Coolant Reservoir Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: all 2025 LT engines | 31405 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | OE Type | View on Amazon |
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.
This group shows a single part: GATES 31405.
Intercooler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: all 2025 LT engines | 2711621 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Original Equipment (OE) # 2516097C91 | View on Amazon |
This table covers the intercoolers that cool turbo or supercharger charge air.
One part is listed for the 2025 International LT — GPD 2711621.
Intercooler Air Hose / Pipe
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 12.4L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged | 26204 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Turbocharger Hose (Ring-Retained)4" x 8" (110 psi) | View on Amazon |
| GATES Fits: 12.4L L6 DIESEL Turbocharged | 26200 | 🇺🇸 US 🇨🇦 CA | Turbocharger Hose (Ring-Retained)Straight Hose | View on Amazon |
| GATES Fits: 12.4L L6 DIESEL Turbocharged, 12.7L L6 DIESEL Turbocharged | 26203 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Turbocharger Hose (Ring-Retained)4" x 6" (110 psi) | View on Amazon |
| GATES Fits: 12.7L L6 DIESEL Turbocharged | 26201 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Turbocharger Hose (Ring-Retained)Straight Hose | View on Amazon |
This table covers the Intercooler Air Hose pipes.
GATES supplies the 4 Intercooler Air Hose / Pipe parts for the 2025 International LT.
This group includes GATES 26204, GATES 26200 and GATES 26203 and the remaining parts above.
Radiator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: all 2025 LT engines | 9282773 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with 34 In Core Heightwithout Frame | View on Amazon |
| GPD Fits: all 2025 LT engines | 9282774 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Original Equipment (OE) # 2516107C91with 34 In Core Height | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: all 2025 LT engines | 20013560P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Aluminum Core with Plastic Tanks | View on Amazon |
| SPECTRA PREMIUM Fits: 12.7L L6 DIESEL Turbocharged, 14.9L L6 DIESEL Turbocharged | 20013560 | 🇲🇽 MX | Aluminum Core / Aluminum Tank | View on Amazon |
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.
4 Radiator parts are listed for the 2025 International LT, from GPD and SPECTRA PREMIUM. 3 parts fit every engine; the other 1 is engine-specific.
In the Economy grade, GPD supplies 2 parts: the catalog's value-priced group. A representative part number is GPD 9282773.
The Standard Replacement section lists 2 options from SPECTRA PREMIUM — built to original-equipment specification. SPECTRA PREMIUM 20013560P is listed in this group.
This group includes GPD 9282773, GPD 9282774 and SPECTRA PREMIUM 20013560P and the remaining parts above.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 14.9L L6 DIESEL Turbocharged | 34148 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Heavy-Duty | View on Amazon |
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.
This group shows a single part: GATES 34148.
Buying Cooling System Parts for a 2025 International LT
On this vehicle, the cooling system system keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses.
- Match the engine first. Some cooling system parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Coolant / Antifreeze and Intercooler Air Hose / Pipe .
Frequently Asked Questions
How many cooling system parts fit the 2025 International LT?
Our catalog currently lists 19 cooling system parts for the 2025 International LT across 8 subcategories and 6 brands, covering all 3 engine options (12.4L L6 DIESEL Turbocharged, 12.7L L6 DIESEL Turbocharged and 14.9L L6 DIESEL Turbocharged). Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2025 International LT engines?
Some do. 10 parts fit every engine; the other 9 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of cooling system problems on a 2025 International LT?
Common symptoms include a rising temperature gauge in traffic, sweet-smelling steam, crusty deposits around hose clamps, or a heater that blows cold. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the thermostat and refill with fresh coolant whenever you change a water pump or radiator; original hoses on an older vehicle are on borrowed time.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2025 International LT was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2025 International LT?
First match the engine — each row shows which engine(s) the part fits. Then replace coolant with the exact specification the manufacturer calls for — mixing chemistries can gel and block small passages. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2025 International LT
Cooling System Parts for Other International LT Years
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