2003 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

17 Coolant / Antifreeze parts are listed for the 2003 Honda Pilot, 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 hard pipes and extra hoses in the coolant circuit. Read more

One part is listed for the 2003 Honda Pilot — GATES 20338.

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 for the 2003 Honda Pilot come from 4 brands — AJUSA, FEL-PRO, MAHLE / CLEVITE and 1 other brand.

Part numbers include AJUSA 16022450, FEL-PRO ES72774 and MAHLE / CLEVITE C32870, among others listed above.

This table covers the Coolant Hose Connector flanges. Read more

One part is listed for the 2003 Honda Pilot — FOUR SEASONS 85156.

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

This group shows a single part: TECHPRO HO3014123.

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 2003 Honda Pilot come from 3 brands — CALORSTAT, DORMAN and MOTORAD.

Listed part numbers: CALORSTAT RC0175, DORMAN 54370 and MOTORAD T135.

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

2 Coolant Water Crossover Mounting Set parts are listed for the 2003 Honda Pilot, from MAHLE / CLEVITE and VICTOR REINZ.

Part numbers include MAHLE / CLEVITE C17813 and VICTOR REINZ 181016001.

This table covers the Cooling Fan control modules. Read more

3 Cooling Fan Control Module parts for the 2003 Honda Pilot come from US MOTOR WORKS.

Listed part numbers: US MOTOR WORKS 16749, US MOTOR WORKS 16789 and US MOTOR WORKS 16795.

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

3 Cooling System Tester Adapter parts are listed for the 2003 Honda Pilot, from MOTORAD and GATES.

Listed part numbers: 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

10 Radiator parts are listed for the 2003 Honda Pilot, from CSF, KOYORAD, AGILITY and 7 other brands. CSF 3472 carries the "Popular" badge.

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

6 Radiator Cap parts are listed for the 2003 Honda Pilot, from MOTORAD, CSF, GATES and 2 other brands. CSF 4514 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: 5 options from CSF, GATES, CALORSTAT and 2 other brands. CSF 4514 is listed in this group.

Part numbers include CSF 4514, MOTORAD ST37 and GATES 31412, among others listed 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

6 Radiator Fan Assembly parts for the 2003 Honda Pilot come from 6 brands — DORMAN, GPD, SKP and 3 other brands. The "Popular" part is DORMAN 620238.

The Economy section: 3 options from DORMAN, GPD and SKP. DORMAN 620238 is listed in this group.

Standard Replacement: 3 parts, from FOUR SEASONS, TYC and UAC. A representative part number is FOUR SEASONS 75345.

This group includes DORMAN 620238, GPD 2811299 and SKP SK620238 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

9 Radiator Hose parts for the 2003 Honda Pilot come from 4 brands — CONTINENTAL, DAYCO, GATES and 1 other brand. The "Popular" part is GATES 22938.

The Economy section: 2 options from CONTINENTAL and DAYCO. CONTINENTAL 52021 is listed in this group.

Standard Replacement: 7 parts, from GATES, CONTINENTAL, DAYCO and 1 other brand. A representative part number is GATES 22938.

This group includes GATES 22938, CONTINENTAL 52021 and DAYCO 81061 and the remaining parts 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

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

16 Temperature Sender / Sensor parts are listed for the 2003 Honda Pilot, from STANDARD MOTOR PRODUCTS, ROSTRA, WELLS and 10 other brands. SKP SK1580154 carries the "Popular" badge.

Economy: 6 parts, from SKP, STANDARD MOTOR PRODUCTS, GPD and 3 other brands. A representative part number is SKP SK1580154.

The Standard Replacement section: 10 options from ROSTRA, WELLS, BECK/ARNLEY and 5 other brands. BECK/ARNLEY 1580154 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

15 Thermostat parts for the 2003 Honda Pilot come from 9 brands — MOTORAD, BECK/ARNLEY, CALORSTAT and 6 other brands. The "Popular" part is MOTORAD 5302170.

Heavy Duty: 2 parts, from MOTORAD and GATES. A representative part number is MOTORAD 5302170.

Premium: 1 part, from MOTORAD. A representative part number is MOTORAD 7302170.

Standard Replacement: 12 parts, from MOTORAD, BECK/ARNLEY, CALORSTAT and 5 other brands. A representative part number is AISIN THH017.

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

12 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2003 Honda Pilot, from BECK/ARNLEY, FEL-PRO, MOTORAD and 9 other brands. BECK/ARNLEY 0390115 carries the "Popular" badge.

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

5 Thermostat Housing / Water Outlet parts for the 2003 Honda Pilot come from 5 brands — GPD, DORMAN, FAMOUS BRAND and 2 other brands. The "Popular" part is GPD 8241401.

The Economy section: 3 options from GPD, DORMAN and FAMOUS BRAND. GPD 8241401 is listed in this group.

Standard Replacement: 2 parts, from BECK/ARNLEY and MOTORAD. A representative part number is BECK/ARNLEY 1470073.

This group includes GPD 8241401, DORMAN 9025024 and FAMOUS BRAND 85156 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

10 Water Pump parts for the 2003 Honda Pilot come from 10 brands — SKP, BECK/ARNLEY, FVP and 7 other brands. The "Popular" part is SKP SK1352380.

The Economy section: 5 options from SKP, BECK/ARNLEY, FVP and 2 other brands. SKP SK1352380 is listed in this group.

Standard Replacement: 5 parts, from AISIN, ACDELCO, DAYCO and 2 other brands. A representative part number is AISIN WPH800.

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

6 Water Pump Gasket parts are listed for the 2003 Honda Pilot, from FEL-PRO, MAHLE / CLEVITE, APEX and 3 other brands. FEL-PRO 35677 carries the "Popular" badge.

This group includes FEL-PRO 35677, MAHLE / CLEVITE K17818 and APEX AWP3161 and the remaining parts above.

This table covers the Water Pump Inlet tubes. Read more

This group shows a single part: CONTINENTAL 63918.