2021 Freightliner M2 Cooling System Parts

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. Read more

11 Coolant / Antifreeze parts are listed for the 2021 Freightliner M2, from PRESTONE, PEAK and VALVOLINE. PRESTONE AF3100 carries the "Popular" badge. 9 parts fit every engine; the other 2 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 6 options from PRESTONE, PEAK and VALVOLINE — rated for severe service. PEAK FCA1GAL 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.

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. Read more

One part is listed for the 2021 Freightliner M2 — DONALDSON P551008.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

This group shows a single part: GPD 2421014.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

7 Intercooler parts are listed for the 2021 Freightliner M2, from GPD and SPECTRA PREMIUM.

Part numbers include GPD 2711526, GPD 2711594 and GPD 2711599, among others listed above.

This table covers the Intercooler Air Hose pipes. Read more

5 Intercooler Air Hose / Pipe parts are listed for the 2021 Freightliner M2, from GATES and CONTINENTAL.

Part numbers include CONTINENTAL 57513, CONTINENTAL 57504 and GATES 26204, among others listed above.

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. Read more

7 Radiator parts are listed for the 2021 Freightliner M2, from SPECTRA PREMIUM and GPD. SPECTRA PREMIUM 20011777P carries the "Popular" badge.

Economy: 2 parts, from GPD. A representative part number is GPD 9282673.

The Standard Replacement section: 4 options from SPECTRA PREMIUM. SPECTRA PREMIUM 20011777P is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

Part numbers include SPECTRA PREMIUM 20011777P, GPD 9282673 and GPD 9282674, among others listed above.

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. Read more

26 Radiator Hose parts for the 2021 Freightliner M2 come from 4 brands — GATES, ACDELCO, CONTINENTAL and 1 other brand. The "Popular" part is CONTINENTAL 60914. They are grouped as Standard Replacement and Universal Hose (Straight, Bulk), with Standard Replacement the largest group at 6 parts from GATES, CONTINENTAL and ACDELCO.

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. Read more

16 Thermostat parts for the 2021 Freightliner M2 come from 3 brands — CALORSTAT, MOTORAD and GATES. The "Popular" part is GATES 34308.

Heavy Duty: 1 part, from GATES. A representative part number is GATES 34308.

Standard Replacement: 6 parts, from CALORSTAT and MOTORAD. A representative part number is CALORSTAT TH713082J.

9 further parts sit outside the graded sections, with the same engine-level match.

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. Read more

One part is listed for the 2021 Freightliner M2 — ELRING 004030.

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. Read more

This group shows a single part: GATES 43570HD.

This table covers the gaskets between the water pump and the block or housing. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

One part is listed for the 2021 Freightliner M2 — ELRING 004010.