2021 Honda Ridgeline 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 for the 2021 Honda Ridgeline come from 6 brands — PRESTONE, PEAK, VALVOLINE and 3 other brands. The "Popular" part is PRESTONE AF3100.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 3 options from PRESTONE, PEAK and VALVOLINE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.

In the Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.

In the Premium grade, PRESTONE and PEAK supply 5 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, BECK/ARNLEY, AISIN, VALVOLINE and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is AISIN ACB003.

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

4 Coolant Hose / Pipe Seal parts are listed for the 2021 Honda Ridgeline, from AJUSA, FEL-PRO, MAHLE / CLEVITE and 1 other brand.

This group includes AJUSA 16022450, FEL-PRO ES72774 and MAHLE / CLEVITE C32870 and the remaining parts above.

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

One part is listed for the 2021 Honda Ridgeline — TECHPRO HO3014147.

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

One part is listed for the 2021 Honda Ridgeline — MOTORAD T107.

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

3 Cooling System Tester Adapter parts for the 2021 Honda Ridgeline come from 2 brands — MOTORAD and GATES.

Part numbers include 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

9 Radiator parts for the 2021 Honda Ridgeline come from 9 brands — ULTRA-POWER, CSF, DENSO and 6 other brands. The "Popular" part is CSF 3644.

The Economy section: 1 option from ULTRA-POWER. ULTRA-POWER 13402 is listed in this group.

Standard Replacement: 8 parts, from CSF, DENSO, FVP and 5 other brands. A representative part number is CSF 3644.

Listed part numbers: CSF 3644, ULTRA-POWER 13402 and DENSO 2219337, 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 for the 2021 Honda Ridgeline come from 4 brands — CALORSTAT, GATES, MOTORAD and 1 other brand.

This group includes CALORSTAT RC0040, GATES 31412 and MOTORAD T37 and the remaining parts above.

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

6 Radiator Fan Assembly parts are listed for the 2021 Honda Ridgeline, from GPD, SKP, VARIOUS MFR and 2 other brands. SKP SK601490 carries the "Popular" badge.

Economy: 4 parts, from GPD, SKP and VARIOUS MFR. A representative part number is SKP SK601490.

The Standard Replacement section: 2 options from TYC and UAC. TYC 601490 is listed in this group.

This group includes SKP SK601490, GPD 2811922 and GPD 2812230 and the remaining parts 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

5 Radiator Hose parts are listed for the 2021 Honda Ridgeline, from DAYCO and GATES. DAYCO 70112 carries the "Popular" badge.

Part numbers include DAYCO 70112, DAYCO 72981 and DAYCO 72492, among others listed above.

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

One part is listed for the 2021 Honda Ridgeline — 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

11 Temperature Sender / Sensor parts for the 2021 Honda Ridgeline come from 10 brands — STANDARD MOTOR PRODUCTS, CALORSTAT, GPD and 7 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS TX215T.

The Economy section: 5 options from STANDARD MOTOR PRODUCTS, CALORSTAT, GPD and 2 other brands. STANDARD MOTOR PRODUCTS TX215T is listed in this group.

Standard Replacement: 6 parts, from STANDARD MOTOR PRODUCTS, WELLS, BECK/ARNLEY and 3 other brands. A representative part number is STANDARD MOTOR PRODUCTS TX215.

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

2 Temperature Sender / Sensor O-Ring parts for the 2021 Honda Ridgeline come from 2 brands — APEX and FEL-PRO.

Listed part numbers: APEX AWO2407 and 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 are listed for the 2021 Honda Ridgeline, from MOTORAD, DORMAN, BECK/ARNLEY and 1 other brand. MOTORAD 951180 carries the "Popular" badge.

Economy: 1 part, from DORMAN. A representative part number is DORMAN 9025836.

The Standard Replacement section: 4 options from MOTORAD, BECK/ARNLEY and FOUR SEASONS. MOTORAD 951180 is listed in this group.

Part numbers include MOTORAD 951180, DORMAN 9025836 and BECK/ARNLEY 1430952, among others listed 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

9 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2021 Honda Ridgeline come from 3 brands — FEL-PRO, MAHLE / CLEVITE and APEX. The "Popular" part is FEL-PRO 35741.

Part numbers include FEL-PRO 35741, FEL-PRO 35162 and APEX AWO2216, among others listed 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 are listed for the 2021 Honda Ridgeline, from AISIN, BECK/ARNLEY, FVP and 5 other brands. AISIN WPH801 carries the "Popular" badge.

Economy: 3 parts, from BECK/ARNLEY, FVP and US MOTOR WORKS. A representative part number is BECK/ARNLEY 1312285.

The Standard Replacement section: 6 options from AISIN, GMB, ACDELCO and 2 other brands. AISIN WPH801 is listed in this group.

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 for the 2021 Honda Ridgeline come from 4 brands — 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.