2025 Honda Pilot 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

10 Coolant / Antifreeze parts are listed for the 2025 Honda Pilot, from PRESTONE, VALVOLINE, AISIN and 1 other brand. PRESTONE AF2100 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, PRESTONE and VALVOLINE supply 2 parts: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

The Heavy Duty section lists 1 option from PRESTONE — rated for severe service. PRESTONE AFC12100 is listed in this group.

The Premium section lists 3 options from PRESTONE — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 3 options from VALVOLINE, AISIN and PENTOSIN — 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

This group shows a single part: AJUSA 16022450.

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

This group shows a single part: TECHPRO AC3014118.

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

This group shows a single part: MOTORAD T107.

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

One part is listed for the 2025 Honda Pilot — GATES 31409.

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

4 Radiator parts are listed for the 2025 Honda Pilot, from GPD, TECHPRO, CSF and 1 other brand.

Economy: 2 parts, from GPD and TECHPRO. A representative part number is GPD 13919C.

The Standard Replacement section: 2 options from CSF and TYC. CSF 3980 is listed in this group.

Part numbers include GPD 13919C, TECHPRO HO3010260 and CSF 3980, among others listed 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 2025 Honda Pilot, 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 fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

3 Radiator Fan Assembly parts for the 2025 Honda Pilot come from 3 brands — TECHPRO, TYC and UAC.

The Economy section: 1 option from TECHPRO. TECHPRO HO3115186 is listed in this group.

Standard Replacement: 2 parts, from TYC and UAC. A representative part number is TYC 601650.

Part numbers include TECHPRO HO3115186, TYC 601650 and UAC FA50997C.

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

3 Radiator Hose parts for the 2025 Honda Pilot come from CONTINENTAL.

Part numbers include CONTINENTAL 66239, CONTINENTAL 66550 and CONTINENTAL 61421.

This table covers the Radiator insulators. Read more

This group shows a single part: TECHPRO HO3013100.

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

This group shows a single part: DORMAN 927241.

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

6 Temperature Sender / Sensor parts are listed for the 2025 Honda Pilot, from STANDARD MOTOR PRODUCTS, CALORSTAT, HOLSTEIN and 2 other brands. STANDARD MOTOR PRODUCTS TX215T carries the "Popular" badge.

Economy: 3 parts, from STANDARD MOTOR PRODUCTS, CALORSTAT and HOLSTEIN. A representative part number is STANDARD MOTOR PRODUCTS TX215T.

The Standard Replacement section: 3 options from WELLS, BECK/ARNLEY and STANDARD MOTOR PRODUCTS. WELLS 5S8970 is listed in this group.

Listed part numbers: STANDARD MOTOR PRODUCTS TX215T, CALORSTAT WS3039 and HOLSTEIN 2CTS0123, plus the other parts above.

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

3 Thermostat parts for the 2025 Honda Pilot come from 3 brands — BECK/ARNLEY, FOUR SEASONS and MOTORAD.

Part numbers include BECK/ARNLEY 1430952, FOUR SEASONS 86234 and MOTORAD 951180.

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

3 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2025 Honda Pilot, from BECK/ARNLEY, ELRING and FEL-PRO.

Listed part numbers: BECK/ARNLEY 0390145, ELRING 108130 and FEL-PRO 35741.

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

3 Water Pump parts for the 2025 Honda Pilot come from 3 brands — JAPANESE OE, GMB and FVP.

The Economy section: 1 option from JAPANESE OE. JAPANESE OE FWH090 is listed in this group.

Standard Replacement: 1 part, from GMB. A representative part number is GMB 1353100.

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

Listed part numbers: JAPANESE OE FWH090 and GMB 1353100, plus the other 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

One part is listed for the 2025 Honda Pilot — FEL-PRO 35677.