The 2018 Freightliner XC has 58 cooling system parts with verified fitment on this page — 9 part types and 16 brands, covering all 3 engine options (14.9L L6 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged and 8.9L L6 DIESEL Turbocharged). Each part includes a manufacturer part number and application notes.
The cooling system system on the 2018 Freightliner XC keeps operating temperature in the narrow band the engine was designed for, from radiator and water pump to thermostat and hoses. The largest groups are Water Pump (20 parts), Coolant / Antifreeze (13 parts) and Thermostat (12 parts). The other 6 part types cover the remaining 13 parts.
The 2018 Freightliner XC was sold with 3 engines. 18 parts fit every engine; the other 40 are engine-specific. Each part shows which engine(s) it fits.
16 brands supply cooling system parts for the 2018 Freightliner XC, led by MOTORAD (8 parts), PRESTONE (7 parts) and US MOTOR WORKS (7 parts), plus 13 more brands. Quality grades include Heavy Duty, Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2018 Freightliner XC. 11 parts have it, including PRESTONE AF3100 (Coolant / Antifreeze) and GATES 21194 (Radiator Hose). 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 XC engines | AF3055 | 🇺🇸 US 🇨🇦 CA | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular Fits: all 2018 XC engines | AF3100 | 🇺🇸 US 🇨🇦 CA | Prime Yellow - All VehiclesExtended Life | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular Fits: all 2018 XC engines | ZXG051 | 🇺🇸 US 🇨🇦 CA | G05 Yellow1 Gallon | View on Amazon |
| PEAK Fits: all 2018 XC engines | FCA1GAL | 🇺🇸 US 🇨🇦 CA | Fleet Charge1 Gallon | View on Amazon |
| PEAK Fits: all 2018 XC engines | FNA1GAL | 🇺🇸 US 🇨🇦 CA | Final Charge1 Gallon | View on Amazon |
| PEAK Fits: all 2018 XC engines | FXA1GAL | 🇺🇸 US 🇨🇦 CA | Final Charge Global1 Gallon | View on Amazon |
| PRESTONE Fits: all 2018 XC engines | AFC10000 | 🇺🇸 US 🇨🇦 CA | Command ESi PrechargedPurple | View on Amazon |
| PRESTONE Fits: all 2018 XC engines | AFC13000 | 🇺🇸 US 🇨🇦 CA | Command COR-Guard Nitrite Free-Noat Extended Life CoolantRed | View on Amazon |
| PRESTONE Fits: all 2018 XC engines | AFC12100 | 🇺🇸 US 🇨🇦 CA | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
| VALVOLINE Fits: all 2018 XC engines | 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 XC engines | AF2100 | 🇺🇸 US 🇨🇦 CA | All Vehicles10yr/300k mi | View on Amazon |
| PRESTONE Fits: all 2018 XC engines | AFMAX | 🇺🇸 US 🇨🇦 CA | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: all 2018 XC engines | 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.
13 Coolant / Antifreeze parts are listed for the 2018 Freightliner XC, from PRESTONE, VALVOLINE and PEAK. PRESTONE AF3100 carries the "Popular" badge. All of them fit every engine offered in the 2018 XC.
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 8 options from PEAK, PRESTONE and VALVOLINE — 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 XC — WIX 24070.
Coolant Level Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: 6.7L L6 DIESEL Turbocharged | 1816403 | 🇺🇸 US | Engine Code ISB 6.7Aluminum | View on Amazon |
| GPD Fits: 6.7L L6 DIESEL Turbocharged | 1816610 | 🇺🇸 US | Engine Code ISB 6.7Brass | View on Amazon |
| GPD Fits: 8.9L L6 DIESEL Turbocharged | 1816611 | 🇺🇸 US | Engine Code ISL 8.9 | View on Amazon |
This table covers the Coolant Level sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
GPD supplies the 3 Coolant Level Sensor parts for the 2018 Freightliner XC.
This group includes GPD 1816403, GPD 1816610 and GPD 1816611.
Intercooler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: all 2018 XC engines | 44011743 | 🇺🇸 US 🇨🇦 CA | with 31.25 IN X 23.9375 IN X 2.9375 IN Corewith 3.5 IN Inlet | View on Amazon |
This table covers the intercoolers that cool turbo or supercharger charge air.
One part is listed for the 2018 Freightliner XC — SPECTRA PREMIUM 44011743.
Radiator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: all 2018 XC engines | 20011519 | 🇺🇸 US 🇨🇦 CA | Aluminum Core / Aluminum Tank | 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.
One part is listed for the 2018 Freightliner XC — SPECTRA PREMIUM 20011519.
Radiator Hose
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 6.7L L6 DIESEL Turbocharged | 21194 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
| ACDELCO Fits: 6.7L L6 DIESEL Turbocharged | 20125S | 🇺🇸 US 🇨🇦 CA | Professional / GoldMolded | View on Amazon |
| DAYCO Fits: 6.7L L6 DIESEL Turbocharged | 70920 | 🇺🇸 US 🇨🇦 CA | Curved | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 52118 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 52123 | 🇺🇸 US 🇨🇦 CA | Molded | 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.
5 Radiator Hose parts for the 2018 Freightliner XC come from 3 brands — GATES, ACDELCO and DAYCO. The "Popular" part is GATES 21194.
Listed part numbers: GATES 21194, ACDELCO 20125S and DAYCO 70920, plus the other parts above.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT Popular Fits: all 2018 XC engines | TH713082J | 🇺🇸 US 🇨🇦 CA | PerformanceIncludes 1 Rubber Gasket | View on Amazon |
| GATES Popular Fits: 6.7L L6 DIESEL Turbocharged | 33915 | 🇺🇸 US 🇨🇦 CA | OE Type | View on Amazon |
| MOTORAD Popular Fits: 14.9L L6 DIESEL Turbocharged | 406190 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
| CALORSTAT Fits: all 2018 XC engines | THS1910582 | 🇺🇸 US 🇨🇦 CA | PerformanceDoes Not Include Seal | View on Amazon |
| CALORSTAT Fits: all 2018 XC engines | THS1910588 | 🇺🇸 US 🇨🇦 CA | Does not include seal | View on Amazon |
| MOTORAD Fits: 14.9L L6 DIESEL Turbocharged | 15199 | 🇺🇸 US 🇨🇦 CA | Fits Heavy Duty190 Degrees F, Includes Seal, For Engine Coolant Systemor Heavy Duty | View on Amazon |
| MOTORAD Fits: 14.9L L6 DIESEL Turbocharged | 406160 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
| MOTORAD Fits: 14.9L L6 DIESEL Turbocharged | 407825 | 🇺🇸 US 🇨🇦 CA | XC Raised Rail225 Degrees F | View on Amazon |
| MOTORAD Fits: 14.9L L6 DIESEL Turbocharged | 406180 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
| MOTORAD Fits: 6.7L L6 DIESEL Turbocharged | 923192 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
| MOTORAD Fits: 8.9L L6 DIESEL Turbocharged | 407160 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
| MOTORAD Fits: 8.9L L6 DIESEL Turbocharged | 407180 | 🇺🇸 US 🇨🇦 CA | Includes Seal | 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.
12 Thermostat parts for the 2018 Freightliner XC come from 3 brands — MOTORAD, CALORSTAT and GATES. The "Popular" part is CALORSTAT TH713082J. 3 parts fit every engine; the other 9 are engine-specific.
Thermostat / Thermostat Housing / Water Outlet Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYTON Fits: 14.9L L6 DIESEL Turbocharged | 6745008G | 🇺🇸 US 🇨🇦 CA | Housing to Cylinder Head | View on Amazon |
| DAYTON Fits: 14.9L L6 DIESEL Turbocharged | 6745003G | 🇺🇸 US 🇨🇦 CA | Housing to Flange | View on Amazon |
This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
DAYTON supplies both parts for the 2018 Freightliner XC.
Part numbers include DAYTON 6745008G and DAYTON 6745003G.
Water Pump
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| US MOTOR WORKS Popular Fits: 14.9L L6 DIESEL Turbocharged | US932 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ISX, ISZ | View on Amazon |
| FVP Fits: 14.9L L6 DIESEL Turbocharged | US932 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ISX, ISZ (12 Groove Pulley) Complete Unit (Short Bottom Outlet) | View on Amazon |
| FVP Fits: 14.9L L6 DIESEL Turbocharged | US6344 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ISX (12 Groove Pulley) | View on Amazon |
| FVP Fits: 8.9L L6 DIESEL Turbocharged | US69NX | 🇺🇸 US | Engine Code ISL 8.9ISC / ISL | View on Amazon |
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 |
|---|---|---|---|---|
| DAYCO Popular Fits: 6.7L L6 DIESEL Turbocharged | DP1909 | 🇺🇸 US 🇨🇦 CA | Serpentine Belt Driven | View on Amazon |
| GMB Popular Fits: 14.9L L6 DIESEL Turbocharged | 1962230 | 🇺🇸 US 🇨🇦 CA | without Water Pump HousingTwo-Piece Pump | View on Amazon |
| MELLING Popular Fits: 6.7L L6 DIESEL Turbocharged | MWP521 | 🇺🇸 US 🇨🇦 CA | 7 Vane Plastic Impeller | View on Amazon |
| DAYCO Fits: 8.9L L6 DIESEL Turbocharged | DP1732 | 🇺🇸 US | Engine Code ISL 8.9Serpentine Belt Driven | View on Amazon |
| GMB Fits: 14.9L L6 DIESEL Turbocharged | 1962230AH | 🇺🇸 US 🇨🇦 CA | Two-Piece Pumpwith Water Pump Housing | View on Amazon |
| GMB Fits: 14.9L L6 DIESEL Turbocharged | 1961020 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ONE-Piece Pump | View on Amazon |
| GMB Fits: 6.7L L6 DIESEL Turbocharged | 1962420 | 🇺🇸 US 🇨🇦 CA | 94.4 mm Pulley | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYTON Fits: 8.9L L6 DIESEL Turbocharged | 9024008 | 🇺🇸 US | Engine Code ISL 8.9 | View on Amazon |
| US MOTOR WORKS Fits: 14.9L L6 DIESEL Turbocharged | US93 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ISX, ISZ | View on Amazon |
| US MOTOR WORKS Fits: 14.9L L6 DIESEL Turbocharged | US6151 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ISX | View on Amazon |
| US MOTOR WORKS Fits: 14.9L L6 DIESEL Turbocharged | US6344 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ISX | View on Amazon |
| US MOTOR WORKS Fits: 14.9L L6 DIESEL Turbocharged | US933 | 🇺🇸 US 🇨🇦 CA | Engine Code ISX 15.0ISX, ISZ | View on Amazon |
| US MOTOR WORKS Fits: 8.9L L6 DIESEL Turbocharged | US69NX | 🇺🇸 US | Engine Code ISL 8.9ISC / ISL | 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.
20 Water Pump parts for the 2018 Freightliner XC come from 7 brands — US MOTOR WORKS, FVP, GMB and 4 other brands. The "Popular" part is US MOTOR WORKS US932.
The Economy section: 4 options from FVP and US MOTOR WORKS. US MOTOR WORKS US932 is listed in this group.
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: 7 parts, from GMB, DAYCO and MELLING. A representative part number is DAYCO DP1909.
6 further parts sit outside the graded sections, with the same engine-level match.
Buying Cooling System Parts for a 2018 Freightliner XC
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: Water Pump and Coolant / Antifreeze .
Frequently Asked Questions
How many cooling system parts fit the 2018 Freightliner XC?
Our catalog currently lists 58 cooling system parts for the 2018 Freightliner XC across 9 subcategories and 16 brands, covering all 3 engine options (14.9L L6 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged and 8.9L L6 DIESEL Turbocharged). Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2018 Freightliner XC engines?
Some do. 18 parts fit every engine; the other 40 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 XC?
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 XC 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 XC?
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 XC
Cooling System Parts for Other Freightliner XC Years
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