19 Cooling system parts are listed for the 2018 Freightliner MB, in 3 part types, covering the 6.7L L6 DIESEL Turbocharged engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2018 Freightliner MB, 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. All 19 listed parts are Coolant / Antifreeze (12 parts), Water Pump (5 parts) and Thermostat (2 parts).
The 2018 Freightliner MB came with a single engine, the 6.7L L6 DIESEL Turbocharged, and every part is verified against it.
10 brands supply cooling system parts for the 2018 Freightliner MB, led by PRESTONE (7 parts), VALVOLINE (3 parts) and PEAK (2 parts), plus 7 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 MB. 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 | AF3055 | 🇺🇸 US | Prime YellowAll Vehicles | View on Amazon |
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF3100 | 🇺🇸 US | Prime Yellow - All VehiclesExtended Life | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Popular | ZXG051 | 🇺🇸 US | G05 Yellow1 Gallon | View on Amazon |
| PEAK | FCA1GAL | 🇺🇸 US | Fleet Charge1 Gallon | View on Amazon |
| PEAK | FXA1GAL | 🇺🇸 US | Final Charge Global1 Gallon | View on Amazon |
| PRESTONE | AFC10000 | 🇺🇸 US | Command ESi PrechargedPurple | View on Amazon |
| PRESTONE | AFC13000 | 🇺🇸 US | Command COR-Guard Nitrite Free-Noat Extended Life CoolantRed | View on Amazon |
| PRESTONE | AFC12100 | 🇺🇸 US | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
| VALVOLINE | 846439 | 🇺🇸 US | HD Nitrite Free Extended Life Yellow1 Gallon | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Popular | AF2100 | 🇺🇸 US | All Vehicles10yr/300k mi | View on Amazon |
| PRESTONE | AFMAX | 🇺🇸 US | Max Universal1 Gallon | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | 861399 | 🇺🇸 US | 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 MB, from PRESTONE, VALVOLINE and PEAK. PRESTONE AF3100 carries the "Popular" badge.
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.
Thermostat
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT | TH713082J | 🇺🇸 US | PerformanceIncludes 1 Rubber Gasket | View on Amazon |
| MOTORAD | 923192 | 🇺🇸 US | 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.
2 Thermostat parts for the 2018 Freightliner MB come from 2 brands — CALORSTAT and MOTORAD.
This group includes CALORSTAT TH713082J and MOTORAD 923192.
Water Pump
High Volume / Pressure
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP | US7123H | 🇺🇸 US | B Series New Style ISB Engine | View on Amazon |
| US MOTOR WORKS | US7123H | 🇺🇸 US | B Series New Style ISB Engine | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MELLING Popular | MWP521 | 🇺🇸 US | 7 Vane Plastic Impeller | View on Amazon |
| DAYCO | DP1000 | 🇺🇸 US | Serpentine Belt Driven | View on Amazon |
| GMB | 1962420 | 🇺🇸 US | 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 MB come from 5 brands — FVP, US MOTOR WORKS, MELLING and 2 other brands. The "Popular" part is MELLING MWP521.
The High Volume / Pressure section lists 2 options from FVP 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: 3 parts, from MELLING, DAYCO and GMB. A representative part number is MELLING MWP521.
Listed part numbers: MELLING MWP521 and FVP US7123H, plus the other parts above.
Buying Cooling System Parts for a 2018 Freightliner MB
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.
- Confirm you have the 6.7L L6 DIESEL Turbocharged engine — every part on this page is matched to it.
- 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 Water Pump .
Frequently Asked Questions
How many cooling system parts fit the 2018 Freightliner MB?
Our catalog currently lists 19 cooling system parts for the 2018 Freightliner MB across 3 subcategories and 10 brands, covering the 6.7L L6 DIESEL Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of cooling system problems on a 2018 Freightliner MB?
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 MB 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 MB?
Every part on this page is matched to the 6.7L L6 DIESEL Turbocharged engine. 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 MB
Cooling System Parts for Other Freightliner MB Years
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