33 Cooling system parts are listed for the 2025 Freightliner M2, in 7 part types, covering all 9 engine options (12.8L L6 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged and more). Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2025 Freightliner M2, 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 Radiator Hose (11 parts), Thermostat (9 parts) and Coolant / Antifreeze (4 parts). The other 4 part types cover the remaining 9 parts.
The 2025 Freightliner M2 was sold with 9 engines. 4 parts fit every engine; the other 29 are engine-specific. Each part shows which engine(s) it fits.
6 brands supply cooling system parts for the 2025 Freightliner M2, led by GATES (13 parts), CALORSTAT (8 parts) and SPECTRA PREMIUM (5 parts), plus 3 more brands. Quality grades include Standard Replacement, Universal Hose and Heavy Duty.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2025 Freightliner M2. 1 part has it: GATES 34308 (Thermostat). Each part number opens a page with every vehicle that part fits.
Coolant / Antifreeze
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PRESTONE Fits: all 2025 M2 engines | AFC10000 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Command ESi PrechargedPurple | View on Amazon |
| PRESTONE Fits: all 2025 M2 engines | AFC12100 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Command Nitrite Free Extended Life CoolantYellow Nitrite Free OAT | View on Amazon |
| PRESTONE Fits: all 2025 M2 engines | 115CEL | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Celsius Extended Life Antifreeze or Command ESi Precharged Can1 Gallon | View on Amazon |
| PRESTONE Fits: all 2025 M2 engines | 78065 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Heavy Duty | 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.
PRESTONE supplies the 4 Coolant / Antifreeze parts for the 2025 Freightliner M2. All of them fit every engine offered in the 2025 M2.
This group includes PRESTONE AFC10000, PRESTONE AFC12100 and PRESTONE 115CEL and the remaining parts above.
Coolant Reservoir
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD Fits: 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged | 2421014 | 🇺🇸 US 🇨🇦 CA | M2 106 | View on Amazon |
This table covers the overflow / expansion tanks that hold extra coolant.
This group shows a single part: GPD 2421014.
Intercooler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: 12.8L L6 DIESEL Turbocharged | 44011727 | 🇺🇸 US 🇨🇦 CA | with Second Design Condenser Mounting Pointswith 35.375 IN X 25.875 IN X 2.4375 IN Core | View on Amazon |
| SPECTRA PREMIUM Fits: 8.9L L6 DIESEL Turbocharged, 8.9L L6 Turbocharged | 44011747 | 🇺🇸 US 🇨🇦 CA | M2 112with 38.8125 IN X 19.5 IN X 1.9375 IN Core | View on Amazon |
This table covers the intercoolers that cool turbo or supercharger charge air.
SPECTRA PREMIUM supplies both parts for the 2025 Freightliner M2.
This group includes SPECTRA PREMIUM 44011727 and SPECTRA PREMIUM 44011747.
Intercooler Air Hose / Pipe
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 12.8L L6 DIESEL Turbocharged | 26204 | 🇺🇸 US 🇨🇦 CA | Turbocharger Hose (Ring-Retained)4" x 8" (110 psi) | View on Amazon |
| GATES Fits: 12.8L L6 DIESEL Turbocharged | 26203 | 🇺🇸 US 🇨🇦 CA | Turbocharger Hose (Ring-Retained)4" x 6" (110 psi) | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged, 8.9L L6 Turbocharged | 26200 | 🇺🇸 US 🇨🇦 CA | Turbocharger Hose (Ring-Retained)Straight Hose | View on Amazon |
This table covers the Intercooler Air Hose pipes.
GATES supplies the 3 Intercooler Air Hose / Pipe parts for the 2025 Freightliner M2.
This group includes GATES 26204, GATES 26203 and GATES 26200.
Radiator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: 12.8L L6 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 7.2L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged, 8.9L L6 DIESEL Turbocharged, 8.9L L6 Turbocharged | 20011777P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Aluminum Core with Plastic Tanks | View on Amazon |
| SPECTRA PREMIUM Fits: 12.8L L6 DIESEL Turbocharged | 20011775P | 🇺🇸 US 🇨🇦 CA | Aluminum Core with Plastic Tanks | View on Amazon |
| SPECTRA PREMIUM Fits: 12.8L L6 DIESEL Turbocharged | 20011775 | 🇺🇸 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.
SPECTRA PREMIUM supplies the 3 Radiator parts for the 2025 Freightliner M2.
Part numbers include SPECTRA PREMIUM 20011777P, SPECTRA PREMIUM 20011775P and SPECTRA PREMIUM 20011775.
Radiator Hose
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 8.9L L6 Turbocharged | 20125S | 🇺🇸 US 🇨🇦 CA | Professional / GoldMolded | View on Amazon |
| GATES Fits: 8.9L L6 Turbocharged | 21194 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
Universal Hose (Straight, Bulk)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Fits: 8.9L L6 Turbocharged | 24232 | 🇺🇸 US 🇨🇦 CA | Straight (Heavy-Duty 2-Ply)2" (60 psi) | View on Amazon |
| GATES Fits: 8.9L L6 Turbocharged | 24840 | 🇺🇸 US 🇨🇦 CA | Straight (Silicone)2.5" | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 6.7L L6 DIESEL Turbocharged | 20007S | 🇺🇸 US 🇨🇦 CA | Professional / GoldMolded | View on Amazon |
| GATES Fits: 12.8L L6 DIESEL Turbocharged | 52127 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
| GATES Fits: 5.1L L4 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | 52128 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
| GATES Fits: 5.1L L4 DIESEL Turbocharged | 52129 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 20206 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 52125 | 🇺🇸 US 🇨🇦 CA | Molded | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged | 52114 | 🇺🇸 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.
11 Radiator Hose parts for the 2025 Freightliner M2 come from 2 brands — GATES and ACDELCO.
In the Standard Replacement grade, ACDELCO and GATES supply 2 parts: built to original-equipment specification. A representative part number is ACDELCO 20125S.
In the Universal Hose (Straight, Bulk) grade, GATES supplies 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 GATES 24232.
7 further parts sit outside the graded sections, with the same engine-level match.
Thermostat
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 8.9L L6 DIESEL Turbocharged | 34308 | 🇺🇸 US 🇨🇦 CA | Heavy-Duty | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT Fits: 8.9L L6 DIESEL Turbocharged | THS1695386 | 🇺🇸 US 🇨🇦 CA | Does not include seal | View on Amazon |
| CALORSTAT Fits: 8.9L L6 DIESEL Turbocharged | THS1680171 | 🇺🇸 US 🇨🇦 CA | PerformanceDoes Not Include Seal | View on Amazon |
| CALORSTAT Fits: 8.9L L6 DIESEL Turbocharged | THS20001M71 | 🇺🇸 US 🇨🇦 CA | PerformanceDoes Not Include Seal | View on Amazon |
| CALORSTAT Fits: 8.9L L6 DIESEL Turbocharged | THS1913377J | 🇺🇸 US 🇨🇦 CA | Includes 1 Rubber Gasket | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CALORSTAT Fits: 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | THS1695386 | 🇺🇸 US 🇨🇦 CA | Does not include seal | View on Amazon |
| CALORSTAT Fits: 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | THS1680171 | 🇺🇸 US 🇨🇦 CA | PerformanceDoes Not Include Seal | View on Amazon |
| CALORSTAT Fits: 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | THS20001M71 | 🇺🇸 US 🇨🇦 CA | PerformanceDoes Not Include Seal | View on Amazon |
| CALORSTAT Fits: 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 7.7L L6 DIESEL Turbocharged | THS1913377J | 🇺🇸 US 🇨🇦 CA | Includes 1 Rubber Gasket | 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.
9 Thermostat parts for the 2025 Freightliner M2 come from 2 brands — CALORSTAT and GATES. The "Popular" part is GATES 34308.
In the Heavy Duty grade, GATES supplies 1 part: rated for severe service. A representative part number is GATES 34308.
Standard Replacement: 4 parts, from CALORSTAT. A representative part number is CALORSTAT THS1695386.
4 further parts sit outside the graded sections, with the same engine-level match.
Listed part numbers: GATES 34308, CALORSTAT THS1695386 and CALORSTAT THS1680171, plus the other parts above.
Buying Cooling System Parts for a 2025 Freightliner M2
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: Radiator Hose and Thermostat .
Frequently Asked Questions
How many cooling system parts fit the 2025 Freightliner M2?
Our catalog currently lists 33 cooling system parts for the 2025 Freightliner M2 across 7 subcategories and 6 brands, covering all 9 engine options (12.8L L6 DIESEL Turbocharged, 4.8L L4 DIESEL Turbocharged, 5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged and more). Each part is matched to the engine(s) it fits.
Do cooling system parts differ between 2025 Freightliner M2 engines?
Some do. 4 parts fit every engine; the other 29 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 2025 Freightliner M2?
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 2025 Freightliner M2 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 2025 Freightliner M2?
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 2025 Freightliner M2
Cooling System Parts for Other Freightliner M2 Years
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