2021 Ram 2500 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

18 Coolant / Antifreeze parts for the 2021 Ram 2500 come from 5 brands — PRESTONE, VALVOLINE, PEAK and 2 other brands. The "Popular" part is FVP MV5050GAL. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 4 options from FVP, PEAK, PRESTONE and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

In the Heavy Duty grade, VALVOLINE and PRESTONE supply 3 parts: rated for severe service. A representative part number is VALVOLINE ZXG051.

In the Premium grade, PRESTONE and PEAK supply 5 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, VALVOLINE, AISIN and PEAK supply 5 parts: built to original-equipment specification. A representative part number is VALVOLINE ZXEL1.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

7 Coolant Hose / Pipe parts for the 2021 Ram 2500 come from MOPAR.

Listed part numbers: MOPAR 68370509AB, MOPAR 68359826AD and MOPAR 68359815AA, plus the other parts above.

This table covers the seals at the Coolant Hose / Pipe. 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

3 Coolant Hose / Pipe Seal parts are listed for the 2021 Ram 2500, from MAHLE / CLEVITE and ELRING.

Part numbers include ELRING 106320, MAHLE / CLEVITE G33890 and MAHLE / CLEVITE G33891.

This table covers the seals at the Coolant Hose Connector / Flange. 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 Ram 2500 — ELRING 109260.

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. Read more

2 Coolant Level Sensor parts for the 2021 Ram 2500 come from 2 brands — MOPAR and STANDARD MOTOR PRODUCTS.

Part numbers include MOPAR 68489744AA and STANDARD MOTOR PRODUCTS FLS346.

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

8 Coolant Reservoir parts are listed for the 2021 Ram 2500, from TECHPRO, MOPAR, DORMAN and 1 other brand. DORMAN 603840 carries the "Popular" badge.

This group includes DORMAN 603840, GPD 2411293 and MOPAR 68184910AE and the remaining parts above.

This table covers the caps on the overflow / expansion tank. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

2 Coolant Reservoir Cap parts are listed for the 2021 Ram 2500, from CALORSTAT and MOTORAD. All of them fit every engine offered in the 2021 2500.

Listed part numbers: CALORSTAT RC0144 and MOTORAD T73.

This table covers the adapters used to pressure-test this cooling system. Read more

2 Cooling System Tester Adapter parts for the 2021 Ram 2500 come from MOTORAD. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

This group includes MOTORAD 3128 and MOTORAD 3034.

This table covers the Hose clamps. Read more

10 Hose Clamp parts for the 2021 Ram 2500 come from MOPAR. The "Popular" part is MOPAR 52006750. 1 part fits every engine; the other 9 are engine-specific.

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

5 Intercooler parts for the 2021 Ram 2500 come from 5 brands — TYC, CSF, GPD and 2 other brands. The "Popular" part is TYC 18132.

This group includes TYC 18132, CSF 6101 and GPD 2711410 and the remaining parts above.

This table covers the Intercooler Air Hose pipes. Read more

4 Intercooler Air Hose / Pipe parts for the 2021 Ram 2500 come from 2 brands — DORMAN and MOPAR.

This group includes DORMAN 667031, DORMAN 667030 and MOPAR 68357482AB and the remaining parts above.

This table covers the Intercooler Hose / Pipe clamps. Read more

DORMAN supplies both parts for the 2021 Ram 2500.

Listed part numbers: DORMAN 55247 and DORMAN 55246.

This table covers the seals at the Intercooler. 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 Ram 2500 — MOPAR 68322667AD.

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

10 Radiator parts for the 2021 Ram 2500 come from 7 brands — GPD, CSF, TYC and 4 other brands. The "Popular" part is CSF 3936. 1 part fits every engine; the other 9 are engine-specific.

The Economy section: 2 options from GPD. GPD 13895C is listed in this group.

Standard Replacement: 8 parts, from CSF, TYC, KOYORAD and 3 other brands. A representative part number is CSF 3936.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

4 Radiator Fan Assembly parts are listed for the 2021 Ram 2500, from TECHPRO, FOUR SEASONS, MOPAR and 1 other brand.

Economy: 1 part, from TECHPRO. A representative part number is TECHPRO CH3115198.

The Standard Replacement section: 3 options from FOUR SEASONS, MOPAR and UAC. FOUR SEASONS 76155 is listed in this group.

Listed part numbers: TECHPRO CH3115198, FOUR SEASONS 76155 and MOPAR 68322663AB, plus the other parts above.

This table covers the Radiator Fan blades. Typical signs include chatter, streaks, or a skip at the top of the stroke. Confirm left and right lengths in the notes — they are often different. Read more

4 Radiator Fan Blade parts are listed for the 2021 Ram 2500, from MOPAR, DORMAN and SKP.

Part numbers include DORMAN 620057, MOPAR 55056947AA and MOPAR 68359841AB, among others listed above.

This table covers the Radiator Fan clutches. Typical signs include slip at highway speed, chatter on takeoff, or a pedal that stays low. Resurface or replace the flywheel with the clutch — a heat-checked flywheel wastes the new disc. Read more

14 Radiator Fan Clutch parts for the 2021 Ram 2500 come from 8 brands — FOUR SEASONS, HAYDEN, US MOTOR WORKS and 5 other brands. The "Popular" part is FOUR SEASONS 46155.

This table covers the brackets that mount the Radiator Fan Clutch Bearing. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

This group shows a single part: GATES FB1022.

This table covers the shrouds that duct air through the fan and radiator. Read more

5 Radiator Fan Shroud parts for the 2021 Ram 2500 come from 2 brands — MOPAR and DORMAN.

Part numbers include DORMAN 620989, MOPAR 68194960AC and MOPAR 68359839AB, 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

7 Radiator Hose parts are listed for the 2021 Ram 2500, from MOPAR and GATES. MOPAR 68359610AD carries the "Popular" badge.

This group includes MOPAR 68359610AD, GATES 52106 and GATES 52108 and the remaining parts above.

This table covers the Radiator Mount bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles. Read more

MOPAR supplies both parts for the 2021 Ram 2500. All of them fit every engine offered in the 2021 2500.

Listed part numbers: MOPAR 68050200AA and MOPAR 68451118AA.

This table covers the seals at the Radiator. 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

MOPAR supplies the 4 Radiator Seal parts for the 2021 Ram 2500. 1 part fits every engine; the other 3 are engine-specific.

Listed part numbers: MOPAR 68362572AB, MOPAR 68362573AB and MOPAR 68359232AB, plus the other parts above.

This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender. Read more

20 Temperature Sender / Sensor parts for the 2021 Ram 2500 come from 11 brands — STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, GPD and 8 other brands. The "Popular" part is DORMAN 926427. 1 part fits every engine; the other 19 are engine-specific.

The Economy section: 9 options from GPD, STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS and 3 other brands. DORMAN 926427 is listed in this group.

The Full Service Kit section lists 1 option from WALKER PRODUCTS — grouped under the catalog's "Full Service Kit" designation — the notes column spells out what sets them apart. WALKER PRODUCTS 21191050 is listed in this group.

Standard Replacement: 10 parts, from NTK, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 3 other brands. A representative part number is DELPHI TS10330.

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

12 Thermostat parts are listed for the 2021 Ram 2500, from MOTORAD, CALORSTAT, DORMAN and 5 other brands. MOTORAD 5426190 carries the "Popular" badge. 1 part fits every engine; the other 11 are engine-specific.

Economy: 2 parts, from DORMAN and SKP. A representative part number is DORMAN 9023045.

The Heavy Duty section: 1 option from MOTORAD. MOTORAD 5426190 is listed in this group.

The Premium section: 1 option from MOTORAD. MOTORAD 7426190 is listed in this group.

The Standard Replacement section: 8 options from MOTORAD, CALORSTAT, FOUR SEASONS and 3 other brands. MOTORAD 426190 is listed in this group.

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

5 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2021 Ram 2500 come from 5 brands — FEL-PRO, AJUSA, APEX and 2 other brands. The "Popular" part is FEL-PRO 35703.

Part numbers include FEL-PRO 35703, AJUSA 01874900 and APEX AWO2263, among others listed above.

This table covers the housings and outlets the thermostat sits in. Read more

4 Thermostat Housing / Water Outlet parts are listed for the 2021 Ram 2500, from MOTORAD and MOPAR.

Listed part numbers: MOPAR 4893177AD, MOTORAD 956216 and MOTORAD CH1073, plus the other parts above.

This table covers the gaskets that seal the Water Inlet. 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

This group shows a single part: MAHLE / CLEVITE C33356.

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

13 Water Pump parts are listed for the 2021 Ram 2500, from FVP, US MOTOR WORKS, GATES and 5 other brands. SKP SK1204540 carries the "Popular" badge.

Economy: 5 parts, from US MOTOR WORKS, FVP and SKP. A representative part number is SKP SK1204540.

The Standard Replacement section: 8 options from GATES, GMB, AISIN and 3 other brands. GATES 42271 is listed in this group.

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

6 Water Pump Gasket parts for the 2021 Ram 2500 come from 4 brands — FEL-PRO, MAHLE / CLEVITE, APEX and 1 other brand.

Listed part numbers: APEX AWP3224, FEL-PRO 36149 and FEL-PRO 35525, plus the other parts above.

This table covers the Water Pump Seal O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

One part is listed for the 2021 Ram 2500 — ELRING 073720.