2021 Ram 3500 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 are listed for the 2021 Ram 3500, from PRESTONE, VALVOLINE, PEAK and 2 other brands. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 2021 3500.

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, FVP, PEAK, PRESTONE and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

The Heavy Duty section lists 3 options from VALVOLINE and PRESTONE — rated for severe service. VALVOLINE ZXG051 is listed in this group.

The Premium section lists 5 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 5 options from VALVOLINE, AISIN and PEAK — built to original-equipment specification. VALVOLINE ZXEL1 is listed in this group.

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

MOPAR supplies the 6 Coolant Hose / Pipe parts for the 2021 Ram 3500.

This group includes MOPAR 68370509AB, MOPAR 68359826AD and MOPAR 68370065AA and the remaining 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

2 Coolant Hose / Pipe Seal parts for the 2021 Ram 3500 come from MAHLE / CLEVITE.

Part numbers include MAHLE / CLEVITE G33890 and MAHLE / CLEVITE G33891.

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 are listed for the 2021 Ram 3500, from MOPAR and STANDARD MOTOR PRODUCTS.

This group includes MOPAR 68489744AA and STANDARD MOTOR PRODUCTS FLS346.

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

8 Coolant Reservoir parts for the 2021 Ram 3500 come from 4 brands — TECHPRO, MOPAR, DORMAN and 1 other brand. The "Popular" part is DORMAN 603840.

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 for the 2021 Ram 3500 come from 2 brands — CALORSTAT and MOTORAD. Every part fits both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged.

Listed part numbers: CALORSTAT RC0144 and MOTORAD T73.

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

MOTORAD supplies both parts for the 2021 Ram 3500.

Part numbers include MOTORAD 3128 and MOTORAD 3034.

This table covers the Hose clamps. Read more

MOPAR supplies the 6 Hose Clamp parts for the 2021 Ram 3500.

Listed part numbers: MOPAR 6506848AA, MOPAR 6512744AA and MOPAR 68211466AA, plus the other parts above.

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

4 Intercooler parts are listed for the 2021 Ram 3500, from CSF, GPD, TECHPRO and 1 other brand.

Listed part numbers: CSF 6101, GPD 2711410 and TECHPRO CH3012114, plus the other parts above.

This table covers the Intercooler Air Hose pipes. Read more

4 Intercooler Air Hose / Pipe parts are listed for the 2021 Ram 3500, from 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

2 Intercooler Hose / Pipe Clamp parts for the 2021 Ram 3500 come from DORMAN.

Part numbers include 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

This group shows a single part: 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

13 Radiator parts are listed for the 2021 Ram 3500, from GPD, CSF, KOYORAD and 4 other brands. CSF 3936 carries the "Popular" badge. 1 part fits every engine; the other 12 are engine-specific.

Economy: 3 parts, from GPD. A representative part number is GPD 13895C.

The Standard Replacement section: 10 options from CSF, KOYORAD, TYC and 3 other brands. CSF 3936 is listed in this group.

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

3 Radiator Fan Assembly parts for the 2021 Ram 3500 come from 3 brands — TECHPRO, FOUR SEASONS and UAC.

The Economy section: 1 option from TECHPRO. TECHPRO CH3115198 is listed in this group.

Standard Replacement: 2 parts, from FOUR SEASONS and UAC. A representative part number is FOUR SEASONS 76155.

This group includes TECHPRO CH3115198, FOUR SEASONS 76155 and UAC FA50972C.

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 for the 2021 Ram 3500 come from 3 brands — 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 are listed for the 2021 Ram 3500, from FOUR SEASONS, HAYDEN, US MOTOR WORKS and 5 other brands. FOUR SEASONS 46155 carries the "Popular" badge.

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

One part is listed for the 2021 Ram 3500 — GATES FB1022.

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

6 Radiator Fan Shroud parts are listed for the 2021 Ram 3500, from 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

6 Radiator Hose parts for the 2021 Ram 3500 come from 2 brands — GATES and MOPAR.

Part numbers include GATES 52106, GATES 52108 and GATES 52107, among others listed above.

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

8 Radiator Seal parts for the 2021 Ram 3500 come from MOPAR. The "Popular" part is MOPAR 68359303AB.

Listed part numbers: MOPAR 68359303AB, MOPAR 68362572AB 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

21 Temperature Sender / Sensor parts are listed for the 2021 Ram 3500, from STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, GPD and 8 other brands. DELPHI TS10330 carries the "Popular" badge.

Economy: 10 parts, from GPD, STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS and 3 other brands. A representative part number is DORMAN 926427.

In the Full Service Kit grade, WALKER PRODUCTS supplies 1 part: grouped under the catalog's "Full Service Kit" designation — the notes column spells out what sets them apart. A representative part number is WALKER PRODUCTS 21191050.

The Standard Replacement section: 10 options from NTK, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 3 other brands. DELPHI TS10330 is listed in this group.

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

11 Thermostat parts for the 2021 Ram 3500 come from 7 brands — MOTORAD, CALORSTAT, DORMAN and 4 other brands. The "Popular" part is MOTORAD 5426190. 1 part fits every engine; the other 10 are engine-specific.

The Economy section: 2 options from DORMAN and SKP. DORMAN 9023045 is listed in this group.

Heavy Duty: 1 part, from MOTORAD. A representative part number is MOTORAD 5426190.

Premium: 1 part, from MOTORAD. A representative part number is MOTORAD 7426190.

Standard Replacement: 7 parts, from MOTORAD, CALORSTAT, FOUR SEASONS and 2 other brands. A representative part number is MOTORAD 426190.

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

4 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2021 Ram 3500, from AJUSA, APEX, FEL-PRO and 1 other brand.

This group includes AJUSA 01874900, APEX AWO2263 and FEL-PRO 35703 and the remaining parts above.

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

3 Thermostat Housing / Water Outlet parts for the 2021 Ram 3500 come from MOTORAD.

Listed part numbers: MOTORAD 956216, MOTORAD CH1073 and MOTORAD CH3092.

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 for the 2021 Ram 3500 come from 8 brands — FVP, US MOTOR WORKS, GATES and 5 other brands. The "Popular" part is SKP SK1204540.

The Economy section: 5 options from US MOTOR WORKS, FVP and SKP. SKP SK1204540 is listed in this group.

Standard Replacement: 8 parts, from GATES, GMB, AISIN and 3 other brands. A representative part number is GATES 42271.

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 are listed for the 2021 Ram 3500, from FEL-PRO, MAHLE / CLEVITE, APEX and 1 other brand.

Part numbers include APEX AWP3224, FEL-PRO 36149 and FEL-PRO 35525, among others listed above.