International LT Coolant Hoses 2017–2026
Silicone coolant hoses, radiator hoses and molded elbows — 4-ply reinforced replacements matched by inner diameter and OEM number, the fix for the most common roadside coolant failure. The LT is International's over-the-road tractor (2017+), successor to the ProStar, with a fast-growing parts aftermarket.
PartStop
Universal Silicone Hump Hose Coupler - 2" ID x 6" Length - 4-Ply Reinforced for Turbo, Intake & Coolant F02484S352
OEM F02484S352
Cooling System
PartStop
EGR Silicone Reducer Hose for Cummins ISX15 - 57mm to 48mm ID - Aramid Reinforced with Stainless Steel Ring F02486S352
OEM 3687223
Cooling System
PartStop
Molded Crankcase Breather Hose - 1.00" ID - Fits Cummins ISX15 & QSX15 - Replaces 4298695, 3427229,F02519S352
OEM 4298695
Cooling System
In Stock30% OFFPartStop
11549 Hose Separator Heavy Duty Trucks 100469D 1004690 10QE125P1 5396-11549
OEM 11549
Cooling System
In Stock30% OFFPartStop
4" x 6" Silicone CAC Hump Hose with 3 Reinforcement Rings - Fits Volvo & International (Navistar) - Heavy Duty Turbo Cold Side
OEM 8072886
Cooling System
International LT Coolant Hoses (2017–2026) — what we stock
Coolant hoses are the quiet killer on a working truck: they look fine right up until a soft spot lets go on a grade and the temp gauge pins. Factory rubber on a International LT of this era has seen years of heat cycles — squeeze a hose near the clamps and if it feels crunchy or gummy, it's telling you something. We stock 4-ply silicone replacements matched by inner diameter and OEM number: silicone shrugs off the heat that hardens rubber, which is why it's the standard upgrade, not just a repair.
The LT is International's over-the-road tractor (2017+), successor to the ProStar, with a fast-growing parts aftermarket.
How to pick the right part for your LT
Match the OEM number on the listing to your parts diagram or the number stamped on the old hose — on the International LT, radiator hoses, molded elbows and heater lines are all specific shapes, and "close enough" kinks or rubs through. Check inner diameter, and replace the constant-torque clamps while you're in there: reusing tired clamps on new silicone is the classic comeback leak. If one hose is done, its twin brothers from the same year are next — many customers do the full set on a truck they plan to keep.
Why buy coolant hoses from PartStop
Every part on this page is Premium Quality aftermarket — a Direct Replacement matched to factory mounting points and backed by a 6+ month warranty. We publish the OEM cross-reference numbers right on the listing (most sellers hide them), we verify fitment by OEM number or VIN before you buy, and orders placed on business days ship same day from our warehouse in Tacoma, WA. Hoses are stocked and ship same business day — a truck down on coolant shouldn't wait a week for rubber. If anything about fitment is unclear, call the counter at (253) 600-1351 — a person who knows trucks answers.
International LT Coolant Hoses — FAQ
Silicone vs rubber — is silicone worth it?
For a truck that works, yes. Silicone tolerates sustained heat that hardens and cracks EPDM rubber, so it's typically the last set of hoses the truck needs. The price difference is small next to one tow bill.
How do I find the right hose for my International LT?
OEM number first — it's on the listing as a cross-reference and usually printed on your old hose. If the number's unreadable, match shape and inner diameter from your parts diagram, or send us your VIN and we'll verify.
Should I replace clamps with the hoses?
Always. Constant-torque clamps are designed for silicone's expansion cycle; old worm clamps bite unevenly and weep. It's a few dollars that decides whether the job holds.
One hose failed — do I replace the rest?
They've all lived the same heat cycles. If the truck is staying in your fleet, a full set is cheap insurance; at minimum, squeeze-test every hose while the coolant is already drained.