What This Hose Is and Where It Goes
This is a molded radiator hose, not straight stock you cut and clamp - it's shaped with a 90-degree bend to route from the radiator outlet to the engine inlet on TranStar 8500 and 4300 series trucks. 2.5" ID, so it seats over the necks these trucks use without an adapter.
Molded hoses matter on these applications because the bend has to clear the fan shroud, AC lines, and whatever else is stuffed under the hood. A universal flex hose might get you there in a pinch, but it'll rub, kink, or collapse under vacuum over time. This one's built to hold its shape.
Rubber compound is the usual EPDM blend rated for coolant and the heat cycling these engines put out. It's not a specialty silicone hose - it's a straightforward molded replacement for a part that wears out from age and heat, not from abuse.
Why These Numbers Cross and What to Check
3558668C1 is the International/Navistar part number. Flexfab F02514S352, Gates 32594, and Dayco 561.55683 are aftermarket manufacturers building to the same shape, ID, and bend angle - that's why they interchange. Different brand, same hose geometry.
Where this can go sideways: some TranStar and 4300 trucks got running changes over the years - different fan shroud clearances, different radiator neck heights depending on engine and cooling package. A 90-degree bend that's off by even an inch in leg length can put stress on the connection points or leave it too loose to clamp right.
Pull the old hose and check the number stamped or molded into it, or run your VIN, before you order. If the old hose is unreadable and you're not sure, measure both legs of the bend and the ID at each end. That's cheaper than shipping a hose back.
Ordering From PartStop
We're in Tacoma - if you're local and need it same-day, call ahead and we'll have it at the counter. If you're not local, it ships nationwide and we don't jerk you around on lead times.
Every hose we sell carries our 6+ month warranty. If it doesn't fit or fails outside of normal wear, we make it right - no games.
Cross-reference numbers get you close, but they're not a guarantee. Confirm against your VIN or the old part number before you order, especially if your truck's had any cooling system work done that might not match the original spec.
3558668C1 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 3558668C1. 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 |
|---|---|
| Flexfab | F02514S352 |
| Gates | 32594 |
| Dayco | 561.55683 |
Frequently asked questions
Does 3558668C1 fit my TranStar 4300?
Likely, but confirm by VIN or check the number on your old hose first. International ran different cooling packages across model years on the 4300, so don't just go by truck model - match the part number or measure the old hose.
Is this the same as the Gates 32594?
Same hose - same bend angle, same 2.5" ID, built to the same shape as 3558668C1. Gates just puts their own number on it. Functionally it's a direct replacement, but double-check your old hose's dimensions if you're not 100% sure on your application.
How do I know if I need a 90-degree hose versus a straight one?
Look at how your old hose is routed - if it's making a sharp bend from the radiator neck to the engine inlet, you need the molded 90. A straight or slightly curved hose won't hold that bend without kinking or collapsing under vacuum.
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.