What This Hose Is and Where It Lives
This is a molded coolant hose, not straight stock — it's got bends built into it to route around the engine and radiator, so it's not something you can just cut from a roll of heater hose and clamp on. International used it across several truck models, and Freightliner picked up the same piece for certain builds, which is why you see both nameplates cross to one number.
It runs coolant between the engine and radiator (or in some setups, to the surge tank), so it's under pressure and heat cycling every time the truck runs. When these go, they usually split at a bend or get soft and start weeping at a clamp point — by the time you see a puddle under the truck, it's already past due.
Why the Numbers Cross and What to Double-Check
3543544C1 is the International part number, and it interchanges with Freightliner's 561.16350 (that's actually Automann's stamping, common on Freightliner-spec parts), plus OE numbers 77530001 and 203322042. Gates lists this hose under 26156 and 26200 in their aftermarket catalog — same hose, different box.
The catch with molded hoses like this one is shape, not just size. Two hoses can have the same inside diameter and still not fit your truck if the bend angles or overall length are different. Before you order, pull the old hose and check the bend pattern against what you're buying, or better yet, read the number off the old part itself if it's still legible.
Engine family and model year matter here too — International swapped hose routing more than once across their truck lines, so a hose that fits one year International pickup or medium-duty won't necessarily fit another year with a different engine option.
Ordering From PartStop
We keep this one in stock in Tacoma, so if you're local you can call ahead and it's usually ready same-day. Outside the area, it ships nationwide and normally goes out same day if you order before our cutoff.
At $64.99 it's not a part you want to guess on and reorder — confirm your VIN or match the old hose's number before you buy. This one carries our standard 6+ month warranty, so if it's wrong or fails early, we'll sort it out, but fit confirmation up front saves everybody the hassle of a return shipment on a hose that's already had coolant in it.
3543544C1 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 3543544C1. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Gates | 26156, 26200 |
| Automann | 561.16350 |
| OE | 77530001, 203322042 |
Frequently asked questions
Does 3543544C1 fit my International truck?
Depends on the model year and engine — International changed hose routing across their lineup more than once. Give us the VIN or read the number off your old hose and we'll confirm before you order.
Is this the same as the Gates 26156?
Same hose, yes — Gates 26156 cross-references to this same International/Freightliner part. Just double check bend shape and length against your old hose since Gates repackages a few similar-looking hoses under close part numbers.
My old hose has no visible part number — how do I know which one to order?
Match it by physical shape — bend angles, length between ends, and inside diameter at each connection. If you can get us the engine model and chassis VIN, we can usually narrow it down without needing the number off the old part.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.