2018 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

17 Coolant / Antifreeze parts are listed for the 2018 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 6 options from BECK/ARNLEY, VALVOLINE, AISIN and 2 other brands — built to original-equipment specification. VALVOLINE 861398 is listed in this group.

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

5 Coolant Hose / Pipe Seal parts for the 2018 Acura RDX come from 4 brands — AJUSA, MAHLE / CLEVITE, FEL-PRO and 1 other brand. The "Popular" part is MAHLE / CLEVITE C32870.

Listed part numbers: MAHLE / CLEVITE C32870, AJUSA 16022400 and AJUSA 16022450, plus the other parts above.

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

This group shows a single part: TECHPRO AC3014117.

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

3 Coolant Reservoir Cap parts for the 2018 Acura RDX come from 3 brands — CALORSTAT, DORMAN and MOTORAD.

Part numbers include CALORSTAT RC0175, DORMAN 54370 and MOTORAD T135.

This table covers the Coolant Water Crossover Mounting sets. Read more

One part is listed for the 2018 Acura RDX — MAHLE / CLEVITE C17813.

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

3 Cooling System Tester Adapter parts are listed for the 2018 Acura RDX, from MOTORAD and GATES.

This group includes GATES 31409, MOTORAD 3124 and MOTORAD 3125.

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 2018 Acura RDX, from CSF, KOYORAD, DENSO and 3 other brands. CSF 3517 carries the "Popular" badge.

Listed part numbers: CSF 3517, KOYORAD A2989 and DENSO 2219558, 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

5 Radiator Cap parts are listed for the 2018 Acura RDX, from MOTORAD, GATES, CALORSTAT and 1 other brand. GATES 31412 carries the "Popular" badge.

The Locking Replacement section lists 1 option from MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. MOTORAD ST37 is listed in this group.

The Standard Replacement section: 4 options from GATES, CALORSTAT, MOTORAD and 1 other brand. GATES 31412 is listed in this group.

This group includes GATES 31412, MOTORAD ST37 and CALORSTAT RC0040 and the remaining parts above.

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

This group shows a single part: DORMAN 490216.

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 2018 Acura RDX come from 3 brands — GPD, TECHPRO and TYC.

The Economy section: 2 options from GPD and TECHPRO. GPD 2811342 is listed in this group.

Standard Replacement: 1 part, from TYC. A representative part number is TYC 601190.

Part numbers include GPD 2811342, TECHPRO AC3115128 and TYC 601190.

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

4 Radiator Hose parts for the 2018 Acura RDX come from 2 brands — CONTINENTAL and GATES.

Part numbers include CONTINENTAL 66359, CONTINENTAL 66246 and GATES 51391, 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

12 Temperature Sender / Sensor parts are listed for the 2018 Acura RDX, from STANDARD MOTOR PRODUCTS, CALORSTAT, GPD and 8 other brands. STANDARD MOTOR PRODUCTS TX215T carries the "Popular" badge.

Economy: 6 parts, from STANDARD MOTOR PRODUCTS, CALORSTAT, GPD and 3 other brands. A representative part number is STANDARD MOTOR PRODUCTS TX215T.

The Standard Replacement section: 6 options from BECK/ARNLEY, WELLS, DELPHI 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 2018 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 2018 Acura RDX come from 4 brands — FOUR SEASONS, BECK/ARNLEY, JAPANESE OE and 1 other brand.

Listed part numbers: BECK/ARNLEY 1430954, FOUR SEASONS 86234 and FOUR SEASONS 86239, plus the other 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

8 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2018 Acura RDX, from FEL-PRO, MAHLE / CLEVITE, APEX and 1 other brand. FEL-PRO 35162 carries the "Popular" badge.

This group includes FEL-PRO 35162, MAHLE / CLEVITE C32021 and APEX AWO2061 and the remaining parts above.

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

9 Water Pump parts for the 2018 Acura RDX come from 8 brands — AISIN, BECK/ARNLEY, FVP and 5 other brands. The "Popular" part is AISIN WPH801.

The Economy section: 3 options from BECK/ARNLEY, FVP and US MOTOR WORKS. BECK/ARNLEY 1312285 is listed in this group.

Standard Replacement: 6 parts, from AISIN, GMB, ACDELCO and 2 other brands. A representative part number is AISIN WPH801.

This group includes AISIN WPH801, BECK/ARNLEY 1312285 and FVP US9470 and the remaining parts above.

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

4 Water Pump Gasket parts are listed for the 2018 Acura RDX, from APEX, BECK/ARNLEY, FEL-PRO and 1 other brand.

Listed part numbers: APEX AWP3161, BECK/ARNLEY 0394112 and FEL-PRO 35677, plus the other parts above.