2021 Acura RDX 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

16 Coolant / Antifreeze parts are listed for the 2021 Acura RDX, from PRESTONE, PEAK, VALVOLINE and 4 other brands. FVP MV5050GAL carries the "Popular" badge.

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, PRESTONE, PEAK 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 1 option from PRESTONE — rated for severe service. PRESTONE AFC12100 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, BECK/ARNLEY and 2 other brands — built to original-equipment specification. VALVOLINE 861398 is listed in this group.

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

DORMAN supplies both parts for the 2021 Acura RDX.

This group includes DORMAN 9365501 and DORMAN 9365502.

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

This group shows a single part: FEL-PRO 36022.

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

This group shows a single part: TECHPRO AC3014116.

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 Acura RDX come from 2 brands — CALORSTAT and MOTORAD.

This group includes CALORSTAT RC0174 and MOTORAD T108.

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

3 Cooling System Tester Adapter parts are listed for the 2021 Acura RDX, from MOTORAD and GATES.

Part numbers include GATES 31409, MOTORAD 3124 and MOTORAD 3125.

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

4 Intercooler parts are listed for the 2021 Acura RDX, from GPD, SPECTRA PREMIUM and TYC.

Part numbers include GPD 2711333, GPD 2711392 and SPECTRA PREMIUM 44011803, 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

6 Radiator parts are listed for the 2021 Acura RDX, from CSF, TYC, AGILITY and 3 other brands. CSF 3897 carries the "Popular" badge.

Listed part numbers: CSF 3897, TYC 13766 and AGILITY 8013766, plus the other parts above.

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

4 Radiator Cap parts are listed for the 2021 Acura RDX, from CALORSTAT, GATES, MOTORAD and 1 other brand.

Part numbers include CALORSTAT RC0040, GATES 31412 and MOTORAD T37, among others listed above.

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

2 Radiator Fan Assembly parts for the 2021 Acura RDX come from 2 brands — TECHPRO and UAC.

The Economy section: 1 option from TECHPRO. TECHPRO AC3115130 is listed in this group.

Standard Replacement: 1 part, from UAC. A representative part number is UAC FA51441C.

This group includes TECHPRO AC3115130 and UAC FA51441C.

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

2 Radiator Hose parts for the 2021 Acura RDX come from CONTINENTAL.

Part numbers include CONTINENTAL 66717 and CONTINENTAL 62432.

This table covers the Radiator insulators. Read more

This group shows a single part: TECHPRO HO3013100.

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

14 Temperature Sender / Sensor parts are listed for the 2021 Acura RDX, from STANDARD MOTOR PRODUCTS, HOLSTEIN, BECK/ARNLEY and 7 other brands. STANDARD MOTOR PRODUCTS TX215T carries the "Popular" badge.

Economy: 6 parts, from HOLSTEIN, STANDARD MOTOR PRODUCTS, CALORSTAT and 2 other brands. A representative part number is STANDARD MOTOR PRODUCTS TX215T.

The Standard Replacement section: 8 options from BECK/ARNLEY, NTK, WELLS and 3 other brands. BECK/ARNLEY 1581570 is listed in this group.

This table covers the Temperature Sender / Sensor 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 Acura RDX — FEL-PRO 72926.

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

5 Thermostat parts for the 2021 Acura RDX come from 5 brands — MOTORAD, AISIN, BECK/ARNLEY and 2 other brands. The "Popular" part is MOTORAD 1116172.

This group includes MOTORAD 1116172, AISIN THH020 and BECK/ARNLEY 1430978 and the remaining parts above.

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 are listed for the 2021 Acura RDX, from FEL-PRO, AJUSA, APEX and 2 other brands. FEL-PRO 35741 carries the "Popular" badge.

Listed part numbers: FEL-PRO 35741, AJUSA 01129500 and APEX AWO2216, plus the other parts above.

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

This group shows a single part: MOTORAD CH3094.

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

6 Water Pump parts for the 2021 Acura RDX come from 5 brands — FVP, JAPANESE OE, US MOTOR WORKS and 2 other brands. The "Popular" part is JAPANESE OE FWH040.

The Economy section: 3 options from JAPANESE OE, FVP and US MOTOR WORKS. JAPANESE OE FWH040 is listed in this group.

Standard Replacement: 3 parts, from GATES, FVP and GMB. A representative part number is GATES 41220.

Listed part numbers: JAPANESE OE FWH040 and FVP US8180, plus the other parts above.