2021 Ram 1500 Classic 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

21 Coolant / Antifreeze parts are listed for the 2021 Ram 1500 Classic, from PRESTONE, VALVOLINE, PEAK and 3 other brands. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 2021 1500 Classic.

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 8 options from VALVOLINE, PRESTONE, ACDELCO and 2 other brands — built to original-equipment specification. ACDELCO 105027 is listed in this group.

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

2 Coolant Hose / Pipe parts are listed for the 2021 Ram 1500 Classic, from DORMAN and ULTRA-POWER.

Part numbers include DORMAN 626603, among others listed above.

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

5 Coolant Reservoir parts for the 2021 Ram 1500 Classic come from 5 brands — DORMAN, GPD, MAHLE / CLEVITE and 2 other brands. The "Popular" part is DORMAN 603571. Every part fits both the 3.6L V6 and the 5.7L V8.

Listed part numbers: DORMAN 603571, GPD 2411130 and MAHLE / CLEVITE CRT312000S, plus the other 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 1500 Classic come from 2 brands — DORMAN and MOTORAD. Every part fits both the 3.6L V6 and the 5.7L V8.

Part numbers include DORMAN 54201 and MOTORAD T134.

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

2 Cooling System Tester Adapter parts are listed for the 2021 Ram 1500 Classic, from GATES and MOTORAD. All of them fit every engine offered in the 2021 1500 Classic.

Listed part numbers: GATES 31413 and MOTORAD 3003.

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 1500 Classic, from OSC, FVP, TECHPRO and 6 other brands. CSF 3662 carries the "Popular" badge. 6 parts fit every engine; the other 7 are engine-specific.

Economy: 2 parts, from OSC and TECHPRO. A representative part number is OSC 13129E.

The Standard Replacement section: 11 options from OSC, FVP, CSF and 5 other brands. CSF 3662 is listed in this group.

This table covers the caps that hold system pressure at the radiator or reservoir neck. 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

5 Radiator Cap parts are listed for the 2021 Ram 1500 Classic, from GATES, MOTORAD and CALORSTAT. GATES 31528 carries the "Popular" badge. 3 parts fit every engine; the other 2 are engine-specific.

The Locking Replacement section lists 2 options from GATES and MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. GATES 31518 is listed in this group.

The Standard Replacement section: 3 options from GATES, CALORSTAT and MOTORAD. GATES 31528 is listed in this group.

Part numbers include GATES 31528, GATES 31518 and MOTORAD ST16, among others listed above.

This table covers the petcocks used to drain the radiator. Read more

This group shows a single part: DORMAN 61134.

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

10 Radiator Fan Assembly parts for the 2021 Ram 1500 Classic come from 8 brands — GPD, TYC, DORMAN and 5 other brands. The "Popular" part is DORMAN 620189.

The Economy section: 4 options from GPD, DORMAN and VARIOUS MFR. DORMAN 620189 is listed in this group.

Standard Replacement: 6 parts, from TYC, AGILITY, FOUR SEASONS and 2 other brands. A representative part number is TYC 622360.

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

2 Radiator Fan Blade parts for the 2021 Ram 1500 Classic come from 2 brands — DORMAN and SKP.

Part numbers include DORMAN 620057 and SKP SK959911.

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

6 Radiator Fan Clutch parts are listed for the 2021 Ram 1500 Classic, from FVP, HAYDEN, US MOTOR WORKS and 2 other brands. HAYDEN 2906 carries the "Popular" badge.

Listed part numbers: HAYDEN 2906, US MOTOR WORKS 22059 and FOUR SEASONS 46088, plus the other parts above.

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

One part is listed for the 2021 Ram 1500 Classic — DORMAN 620985.

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

9 Radiator Hose parts for the 2021 Ram 1500 Classic come from 4 brands — GATES, DAYCO, ACDELCO and 1 other brand. The "Popular" part is GATES 23605.

Part numbers include GATES 23605, ACDELCO 27004X and CONTINENTAL 66164, among others listed 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

16 Temperature Sender / Sensor parts are listed for the 2021 Ram 1500 Classic, from STANDARD MOTOR PRODUCTS, GPD, HOLSTEIN and 7 other brands. DELPHI TS10330 carries the "Popular" badge. 1 part fits every engine; the other 15 are engine-specific.

Economy: 7 parts, from GPD, HOLSTEIN, STANDARD MOTOR PRODUCTS and 2 other brands. A representative part number is GPD 1814517.

The Standard Replacement section: 9 options from STANDARD MOTOR PRODUCTS, WALKER PRODUCTS, WELLS 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

22 Thermostat parts for the 2021 Ram 1500 Classic come from 7 brands — MOTORAD, CALORSTAT, DORMAN and 4 other brands. The "Popular" part is DORMAN 9023115. 2 parts fit every engine; the other 20 are engine-specific.

The Economy section: 2 options from DORMAN and SKP. DORMAN 9023115 is listed in this group.

Heavy Duty: 3 parts, from MOTORAD. A representative part number is MOTORAD 5416203.

The Performance section lists 3 options from MOTORAD — engineered beyond original-equipment specification. MOTORAD 2416160 is listed in this group.

Premium: 2 parts, from MOTORAD. A representative part number is MOTORAD 7416203.

Standard Replacement: 11 parts, from MOTORAD, CALORSTAT, GATES and 1 other brand. A representative part number is GATES 34053.

1 further part sits 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

9 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2021 Ram 1500 Classic, from FEL-PRO, APEX and MAHLE / CLEVITE. FEL-PRO 35974 carries the "Popular" badge.

Listed part numbers: FEL-PRO 35974, APEX AWO2330 and APEX AWO2331, plus the other parts above.

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

12 Thermostat Housing / Water Outlet parts for the 2021 Ram 1500 Classic come from 7 brands — DORMAN, SKP, FOUR SEASONS and 4 other brands. The "Popular" part is DORMAN 9023102HP.

The Economy section: 5 options from DORMAN and SKP. DORMAN 9023102HP is listed in this group.

Standard Replacement: 6 parts, from FOUR SEASONS, MOTORAD, AUTOTECNICA and 1 other brand. A representative part number is AUTOTECNICA CY0719439.

1 further part sits outside the graded sections, with the same engine-level match.

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

17 Water Pump parts for the 2021 Ram 1500 Classic come from 11 brands — GMB, WJB / INMOTION PARTS, GATES and 8 other brands. The "Popular" part is SKP SK1204450.

The Economy section: 6 options from WJB / INMOTION PARTS, SKP, BECK/ARNLEY and 2 other brands. SKP SK1204450 is listed in this group.

Standard Replacement: 11 parts, from GMB, GATES, AISIN and 3 other brands. A representative part number is ACDELCO 252983.

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

9 Water Pump Gasket parts are listed for the 2021 Ram 1500 Classic, from FEL-PRO, APEX, MAHLE / CLEVITE and 2 other brands. FEL-PRO 35907 carries the "Popular" badge.

Listed part numbers: FEL-PRO 35907, AJUSA 01704700 and APEX AWP3283, plus the other parts above.