2003 Honda S2000 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 2003 Honda S2000 come from 7 brands — PRESTONE, PEAK, VALVOLINE and 4 other brands. The "Popular" part is FVP MV5050GAL.

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 4 options from FVP, PRESTONE, PEAK and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

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, VALVOLINE, AISIN and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is VALVOLINE 861398.

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

This group shows a single part: CONTINENTAL 63302.

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

3 Coolant Reservoir parts are listed for the 2003 Honda S2000, from DORMAN, GPD and TECHPRO.

Part numbers include DORMAN 603320, GPD 2411381 and TECHPRO HO3014125.

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 are listed for the 2003 Honda S2000, from CALORSTAT, DORMAN and MOTORAD.

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

This table covers the Cooling Fan control modules. Read more

US MOTOR WORKS supplies the 3 Cooling Fan Control Module parts for the 2003 Honda S2000.

Part numbers include 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 for the 2003 Honda S2000 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

6 Radiator parts for the 2003 Honda S2000 come from 6 brands — FAMOUS BRAND, KOYORAD, TYC and 3 other brands. The "Popular" part is KOYORAD A13016.

The Economy section: 1 option from FAMOUS BRAND. FAMOUS BRAND 433874 is listed in this group.

Standard Replacement: 5 parts, from KOYORAD, TYC, AGILITY and 2 other brands. A representative part number is KOYORAD A13016.

This group includes KOYORAD A13016, FAMOUS BRAND 433874 and TYC 13016 and the remaining 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

6 Radiator Cap parts for the 2003 Honda S2000 come from 5 brands — MOTORAD, CSF, GATES and 2 other brands. The "Popular" part is CSF 4514.

In the Locking Replacement grade, MOTORAD supplies 1 part: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is MOTORAD ST37.

Standard Replacement: 5 parts, from CSF, GATES, CALORSTAT and 2 other brands. A representative part number is CSF 4514.

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

One part is listed for the 2003 Honda S2000 — DORMAN 490216.

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

One part is listed for the 2003 Honda S2000 — UAC FA50222C.

This table covers the Radiator Fan motors. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

2 Radiator Fan Motor parts for the 2003 Honda S2000 come from 2 brands — ACDELCO and FOUR SEASONS.

Part numbers include ACDELCO 1580329 and FOUR SEASONS 35254.

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 are listed for the 2003 Honda S2000, from ACDELCO and GATES.

Listed part numbers: ACDELCO 26460X, ACDELCO 26461X and GATES 22824, plus the other 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

One part is listed for the 2003 Honda S2000 — 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

14 Temperature Sender / Sensor parts for the 2003 Honda S2000 come from 13 brands — STANDARD MOTOR PRODUCTS, SKP, GPD and 10 other brands. The "Popular" part is SKP SK1580154.

The Economy section: 6 options from SKP, STANDARD MOTOR PRODUCTS, GPD and 3 other brands. SKP SK1580154 is listed in this group.

Standard Replacement: 8 parts, from BECK/ARNLEY, DELPHI, FOUR SEASONS and 5 other brands. A representative part number is BECK/ARNLEY 1580154.

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 are listed for the 2003 Honda S2000, from MOTORAD, BECK/ARNLEY, CALORSTAT and 6 other brands. MOTORAD 5302170 carries the "Popular" badge.

The Heavy Duty section lists 2 options from MOTORAD and GATES — rated for severe service. MOTORAD 5302170 is listed in this group.

The Premium section: 1 option from MOTORAD. MOTORAD 7302170 is listed in this group.

The Standard Replacement section: 12 options from MOTORAD, BECK/ARNLEY, CALORSTAT and 5 other brands. AISIN THH017 is listed in this group.

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 2003 Honda S2000 come from 9 brands — FEL-PRO, MOTORAD, AISIN and 6 other brands. The "Popular" part is FEL-PRO 35162.

Listed part numbers: FEL-PRO 35162, MOTORAD MG81 and AISIN THP509, plus the other parts above.

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

5 Thermostat Housing / Water Outlet parts are listed for the 2003 Honda S2000, from DORMAN, GPD, BECK/ARNLEY and 2 other brands. BECK/ARNLEY 1470088 carries the "Popular" badge.

Economy: 2 parts, from DORMAN and GPD. A representative part number is DORMAN 9025098.

The Standard Replacement section: 3 options from BECK/ARNLEY, FOUR SEASONS and MOTORAD. BECK/ARNLEY 1470088 is listed in this group.

This group includes BECK/ARNLEY 1470088, DORMAN 9025098 and GPD 8241475 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

5 Water Pump parts are listed for the 2003 Honda S2000, from BECK/ARNLEY, US MOTOR WORKS, WJB / INMOTION PARTS and 2 other brands. GATES 43506 carries the "Popular" badge.

Economy: 3 parts, from BECK/ARNLEY, US MOTOR WORKS and WJB / INMOTION PARTS. A representative part number is BECK/ARNLEY 1312292.

The Standard Replacement section: 2 options from GATES and DAYCO. GATES 43506 is listed in this group.

Part numbers include GATES 43506, BECK/ARNLEY 1312292 and US MOTOR WORKS US9403, among others listed 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

This group shows a single part: BECK/ARNLEY 0394187.