This page lists 30 cooling system parts for the 2018 Freightliner S2, across 6 part types, covering both the 6.7L L6 DIESEL Turbocharged and the 8.0L V8 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2018 Freightliner S2, 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. 22 parts of the 30 listed are Coolant / Antifreeze (12 parts), Thermostat (5 parts) and Water Pump (5 parts). The other 3 part types cover the remaining 8 parts.
The 2018 Freightliner S2 was sold with both the 6.7L L6 DIESEL Turbocharged and the 8.0L V8 Turbocharged. 7 parts fit every engine; the other 23 are engine-specific. Each part shows which engine(s) it fits.
12 brands supply cooling system parts for the 2018 Freightliner S2, led by PRESTONE (7 parts), GATES (6 parts) and VALVOLINE (3 parts), plus 9 more brands. Quality grades include Heavy Duty, Standard Replacement and High Volume / Pressure.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 Freightliner S2. 4 parts have it, including PRESTONE AF3100 (Coolant / Antifreeze) and MELLING MWP521 (Water Pump). Each part number opens a page with every vehicle that part fits.
Coolant / Antifreeze
Compatible With All Colors
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: all 2018 S2 engines | AF3055 | 🇺🇸 US 🇨🇦 CA | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: all 2018 S2 engines | AF3100 | 🇺🇸 US 🇨🇦 CA | Prime Yellow - All VehiclesExtended Life | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: 6.7L L6 DIESEL Turbocharged | ZXG051 | 🇺🇸 US 🇨🇦 CA | G05 Yellow1 Gallon | View on Amazon |
| PEAK Fits: 6.7L L6 DIESEL Turbocharged | FCA1GAL | 🇺🇸 US 🇨🇦 CA | Fleet Charge1 Gallon | View on Amazon |
| PEAK Fits: 6.7L L6 DIESEL Turbocharged | FXA1GAL | 🇺🇸 US 🇨🇦 CA | Final Charge Global1 Gallon | View on Amazon |
| PRESTONE Fits: all 2018 S2 engines | AFC10000 | 🇺🇸 US 🇨🇦 CA | Command ESi PrechargedPurple | View on Amazon |
| PRESTONE Fits: all 2018 S2 engines | AFC13000 | 🇺🇸 US 🇨🇦 CA | Command COR-Guard Nitrite Free-Noat Extended Life CoolantRed | View on Amazon |
| PRESTONE Fits: all 2018 S2 engines | AFC12100 | 🇺🇸 US 🇨🇦 CA | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
| VALVOLINE Fits: 6.7L L6 DIESEL Turbocharged | 846439 | 🇺🇸 US 🇨🇦 CA | HD Nitrite Free Extended Life Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: all 2018 S2 engines | AF2100 | 🇺🇸 US 🇨🇦 CA | All Vehicles10yr/300k mi | View on Amazon |
| PRESTONE Fits: all 2018 S2 engines | AFMAX | 🇺🇸 US 🇨🇦 CA | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: 6.7L L6 DIESEL Turbocharged | 861399 | 🇺🇸 US 🇨🇦 CA | G40 Pink1 Gallon | 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.
12 Coolant / Antifreeze parts are listed for the 2018 Freightliner S2, from PRESTONE, VALVOLINE and PEAK. PRESTONE AF3100 carries the "Popular" badge. 7 parts fit every engine; the other 5 are engine-specific.
The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.
In the Economy grade, PRESTONE supplies 1 part: the catalog's value-priced group. A representative part number is PRESTONE AF3100.
The Heavy Duty section lists 7 options from PRESTONE, VALVOLINE and PEAK — rated for severe service. VALVOLINE ZXG051 is listed in this group.
The Premium section lists 2 options from PRESTONE — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.
The Standard Replacement section lists 1 option from VALVOLINE — built to original-equipment specification. VALVOLINE 861399 is listed in this group.
Coolant Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WIX Fits: 6.7L L6 DIESEL Turbocharged | 24070 | 🇺🇸 US 🇨🇦 CA | Height: 5.214 InCoolant Spin-On Filter | 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 2018 Freightliner S2 — WIX 24070.
Intercooler Air Hose / Pipe
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 6.7L L6 DIESEL Turbocharged | 57504 | 🇺🇸 US 🇨🇦 CA | Convoluted Charge Air | View on Amazon |
| CONTINENTAL Fits: 6.7L L6 DIESEL Turbocharged | 57512 | 🇺🇸 US 🇨🇦 CA | Convoluted Charge Air | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 26200 | 🇺🇸 US 🇨🇦 CA | Turbocharger Hose (Ring-Retained)Straight Hose | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 26201 | 🇺🇸 US 🇨🇦 CA | Turbocharger Hose (Ring-Retained)Straight Hose | View on Amazon |
This table covers the Intercooler Air Hose pipes.
4 Intercooler Air Hose / Pipe parts are listed for the 2018 Freightliner S2, from CONTINENTAL and GATES.
Part numbers include CONTINENTAL 57504, CONTINENTAL 57512 and GATES 26200, among others listed above.
Radiator Hose
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 52168 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
Universal Hose (Straight, Bulk)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 6.7L L6 DIESEL Turbocharged | 57032 | 🇺🇸 US 🇨🇦 CA | Heavy Duty Straight | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 24232 | 🇺🇸 US 🇨🇦 CA | Straight (Heavy-Duty 2-Ply)2" (60 psi) | 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.
3 Radiator Hose parts for the 2018 Freightliner S2 come from 2 brands — GATES and CONTINENTAL.
Standard Replacement: 1 part, from GATES. A representative part number is GATES 52168.
In the Universal Hose (Straight, Bulk) grade, CONTINENTAL and GATES supply 2 parts: grouped under the catalog's "Universal Hose (Straight, Bulk)" designation — the notes column spells out what sets them apart. A representative part number is CONTINENTAL 57032.
Part numbers include GATES 52168, CONTINENTAL 57032 and GATES 24232.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT Fits: 6.7L L6 DIESEL Turbocharged | TH713082J | 🇺🇸 US 🇨🇦 CA | PerformanceIncludes 1 Rubber Gasket | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 33915 | 🇺🇸 US 🇨🇦 CA | OE Type | View on Amazon |
| MOTORAD Fits: 6.7L L6 DIESEL Turbocharged | 923192 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
| MOTORAD Fits: 8.0L V8 Turbocharged | 400995 | 🇺🇸 US 🇨🇦 CA | 195 Degrees FOE Specified Temperature 195 Degrees | View on Amazon |
| MOTORAD Fits: 8.0L V8 Turbocharged | 400980 | 🇺🇸 US 🇨🇦 CA | 180 Degrees FOE Specified Temperature | 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.
5 Thermostat parts for the 2018 Freightliner S2 come from 3 brands — MOTORAD, CALORSTAT and GATES.
Part numbers include CALORSTAT TH713082J, GATES 33915 and MOTORAD 923192, among others listed above.
Water Pump
High Volume / Pressure
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Fits: 6.7L L6 DIESEL Turbocharged | US7123H | 🇺🇸 US 🇨🇦 CA | B Series New Style ISB Engine | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 42241HD | 🇺🇸 US 🇨🇦 CA | Water Pump (Heavy-Duty) | View on Amazon |
| US MOTOR WORKS Fits: 6.7L L6 DIESEL Turbocharged | US7123H | 🇺🇸 US 🇨🇦 CA | B Series New Style ISB Engine | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MELLING Popular Fits: 6.7L L6 DIESEL Turbocharged | MWP521 | 🇺🇸 US 🇨🇦 CA | 7 Vane Plastic Impeller | View on Amazon |
| GMB Fits: 6.7L L6 DIESEL Turbocharged | 1962420 | 🇺🇸 US 🇨🇦 CA | 94.4 mm Pulley | View on Amazon |
This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off.
5 Water Pump parts for the 2018 Freightliner S2 come from 5 brands — FVP, GATES, US MOTOR WORKS and 2 other brands. The "Popular" part is MELLING MWP521.
The High Volume / Pressure section lists 3 options from FVP, GATES and US MOTOR WORKS — grouped under the catalog's "High Volume / Pressure" designation — the notes column spells out what sets them apart. FVP US7123H is listed in this group.
Standard Replacement: 2 parts, from MELLING and GMB. A representative part number is MELLING MWP521.
Listed part numbers: MELLING MWP521, FVP US7123H and GATES 42241HD, plus the other parts above.
Buying Cooling System Parts for a 2018 Freightliner S2
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 Thermostat .
Frequently Asked Questions
How many cooling system parts fit the 2018 Freightliner S2?
Our catalog currently lists 30 cooling system parts for the 2018 Freightliner S2 across 6 subcategories and 12 brands, covering both the 6.7L L6 DIESEL Turbocharged and the 8.0L V8 Turbocharged. Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2018 Freightliner S2 engines?
Some do. 7 parts fit every engine; the other 23 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 2018 Freightliner S2?
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 2018 Freightliner S2 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 2018 Freightliner S2?
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 2018 Freightliner S2
Cooling System Parts for Other Freightliner S2 Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.