The 2003 Kenworth T300 has 10 cooling system parts with verified fitment on this page — 5 part types and 7 brands, covering all 3 engine options (5.9L L6 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged and 8.3L L6 DIESEL Turbocharged). Each part includes a manufacturer part number and application notes.
On the 2003 Kenworth T300, 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. Most of the listed parts are Coolant Filter (4 parts), Intercooler (2 parts) and Radiator Hose (2 parts). The other 2 part types cover the remaining 2 parts.
The 2003 Kenworth T300 was sold with 3 engines. 4 parts fit every engine; the other 6 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2003 Kenworth T300 cooling system parts are SPECTRA PREMIUM (3 parts), FAMOUS BRAND (2 parts) and CHAMP / LUBER-FINER (1 part), plus 4 more brands.
Each part number listed for the 2003 Kenworth T300 opens a page with every vehicle that part fits.
Coolant Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CHAMP / LUBER-FINER Fits: 8.3L L6 DIESEL Turbocharged | LFW4071 | 🇺🇸 US 🇨🇦 CA | Spin-On | View on Amazon |
| FAMOUS BRAND Fits: 5.9L L6 DIESEL Turbocharged, 8.3L L6 DIESEL Turbocharged | 96324 | 🇺🇸 US 🇨🇦 CA | COOLANT | View on Amazon |
| FAMOUS BRAND Fits: 8.3L L6 DIESEL Turbocharged | 89071 | 🇺🇸 US 🇨🇦 CA | CoolantOE Number : WF2051 | View on Amazon |
| FRAM Fits: 7.2L L6 DIESEL Turbocharged | PR7308 | 🇺🇸 US 🇨🇦 CA | Spin-OnContains 8-Units Type 2 SCA | 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.
4 Coolant Filter parts for the 2003 Kenworth T300 come from 3 brands — FAMOUS BRAND, CHAMP / LUBER-FINER and FRAM.
This group includes CHAMP / LUBER-FINER LFW4071, FAMOUS BRAND 96324 and FAMOUS BRAND 89071 and the remaining parts above.
Intercooler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: all 2003 T300 engines | 44012507 | 🇺🇸 US 🇨🇦 CA | Charge Air Coolers | View on Amazon |
| SPECTRA PREMIUM Fits: all 2003 T300 engines | 44012506 | 🇺🇸 US 🇨🇦 CA | 33-1/2 In. X 9-1/8 In. X 4-1/4 In. Core3-1/2 In. Inlet / 3-1/2 In. Outlet | View on Amazon |
This table covers the intercoolers that cool turbo or supercharger charge air.
2 Intercooler parts for the 2003 Kenworth T300 come from SPECTRA PREMIUM. Every part fits all 3 engine options (5.9L L6 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged and 8.3L L6 DIESEL Turbocharged).
Part numbers include SPECTRA PREMIUM 44012507 and SPECTRA PREMIUM 44012506.
Radiator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: all 2003 T300 engines | 20012510 | 🇺🇸 US 🇨🇦 CA | 34-11/16" X 16-5/16" X 2-1/4" CoreInlet 2-1/4" | 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.
This group shows a single part: SPECTRA PREMIUM 20012510.
Radiator Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: all 2003 T300 engines | 31350 | 🇺🇸 US 🇨🇦 CA | Heavy-Duty Radiator Cap | View on Amazon |
This table covers the caps that hold system pressure at the radiator or reservoir neck. 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 31350.
Radiator Hose
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 7.2L L6 DIESEL Turbocharged | 22449M | 🇺🇸 US 🇨🇦 CA | Gold / ProfessionalMolded | View on Amazon |
| DAYCO Fits: 7.2L L6 DIESEL Turbocharged, 8.3L L6 DIESEL Turbocharged | 72160 | 🇺🇸 US 🇨🇦 CA | Curved | View on Amazon |
This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle.
2 Radiator Hose parts are listed for the 2003 Kenworth T300, from ACDELCO and DAYCO.
Listed part numbers: ACDELCO 22449M and DAYCO 72160.
Buying Cooling System Parts for a 2003 Kenworth T300
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 Filter and Intercooler .
Frequently Asked Questions
How many cooling system parts fit the 2003 Kenworth T300?
Our catalog currently lists 10 cooling system parts for the 2003 Kenworth T300 across 5 subcategories and 7 brands, covering all 3 engine options (5.9L L6 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged and 8.3L L6 DIESEL Turbocharged). Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2003 Kenworth T300 engines?
Some do. 4 parts fit every engine; the other 6 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 2003 Kenworth T300?
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 2003 Kenworth T300 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 2003 Kenworth T300?
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 2003 Kenworth T300
Cooling System Parts for Other Kenworth T300 Years
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