2003 Honda Civic 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 are listed for the 2003 Honda Civic, 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 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 Civic — GATES 19489.

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 Civic come from 4 brands — APEX, FEL-PRO, MAHLE / CLEVITE and 1 other brand.

This group includes APEX AWO2317, FEL-PRO 36022 and MAHLE / CLEVITE C32045 and the remaining parts above.

This table covers the seals at the Coolant Hose Connector / Flange. 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: ELRING 927280.

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

3 Coolant Reservoir parts for the 2003 Honda Civic come from TECHPRO.

Part numbers include TECHPRO HO3014109, TECHPRO HO3014117 and TECHPRO HO3014114.

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 Civic come from 3 brands — CALORSTAT, DORMAN and MOTORAD.

Part numbers include CALORSTAT RC0207, DORMAN 54227 and MOTORAD T165.

This table covers the Cooling Fan control modules. Read more

2 Cooling Fan Control Module parts for the 2003 Honda Civic come from US MOTOR WORKS.

This group includes 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 Civic, 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

8 Radiator parts are listed for the 2003 Honda Civic, from UAC, KOYORAD, TYC and 4 other brands. KOYORAD A2574 carries the "Popular" badge.

Part numbers include KOYORAD A2574, TYC 2574 and AGILITY 8012574, 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

6 Radiator Cap parts are listed for the 2003 Honda Civic, 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.

Listed part numbers: CSF 4514, MOTORAD ST37 and GATES 31412, plus the other 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

6 Radiator Fan Assembly parts for the 2003 Honda Civic come from 6 brands — GPD, TECHPRO, TYC and 3 other brands. The "Popular" part is TYC 600380.

The Economy section: 2 options from GPD and TECHPRO. GPD 2811277 is listed in this group.

Standard Replacement: 4 parts, from TYC, VDO / CONTINENTAL, ACKOJA and 1 other brand. A representative part number is TYC 600380.

Listed part numbers: TYC 600380, GPD 2811277 and TECHPRO HO3115115, plus the other parts above.

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

3 Radiator Fan Motor parts are listed for the 2003 Honda Civic, from ACDELCO, FOUR SEASONS and TYC.

Part numbers include ACDELCO 1580329, FOUR SEASONS 35254 and TYC 630840.

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

7 Radiator Hose parts for the 2003 Honda Civic come from 4 brands — GATES, ACDELCO, CONTINENTAL and 1 other brand. The "Popular" part is DAYCO 72141.

Listed part numbers: DAYCO 72141, GATES 23245 and ACDELCO 22587M, 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

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

17 Temperature Sender / Sensor parts are listed for the 2003 Honda Civic, from HOLSTEIN, STANDARD MOTOR PRODUCTS, SKP and 12 other brands. SKP SK5S1529 carries the "Popular" badge.

Economy: 6 parts, from HOLSTEIN, SKP, GPD and 2 other brands. A representative part number is SKP SK5S1529.

The Standard Replacement section: 11 options from BECK/ARNLEY, DELPHI, HELLA and 8 other brands. BECK/ARNLEY 1580811 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

2 Temperature Sender / Sensor O-Ring parts are listed for the 2003 Honda Civic, from APEX and FEL-PRO.

This group includes 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

13 Thermostat parts for the 2003 Honda Civic come from 11 brands — MOTORAD, AUTOTECNICA, SKP and 8 other brands. The "Popular" part is AISIN THH001.

The Economy section: 2 options from AUTOTECNICA and SKP. AUTOTECNICA HA0718713 is listed in this group.

Standard Replacement: 11 parts, from MOTORAD, AISIN, GATES and 6 other brands. A representative part number is AISIN THH001.

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

20 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2003 Honda Civic, from FEL-PRO, MAHLE / CLEVITE, APEX and 4 other brands. FEL-PRO 35892 carries the "Popular" badge.

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

8 Thermostat Housing / Water Outlet parts for the 2003 Honda Civic come from 8 brands — DORMAN, AUTOTECNICA, FAMOUS BRAND and 5 other brands. The "Popular" part is DORMAN 902117.

The Economy section: 5 options from DORMAN, AUTOTECNICA, FAMOUS BRAND and 2 other brands. DORMAN 902117 is listed in this group.

Standard Replacement: 3 parts, from MOTORAD, FOUR SEASONS and GATES. A representative part number is MOTORAD CH6016.

Listed part numbers: DORMAN 902117, AUTOTECNICA HA0718714 and FAMOUS BRAND 85194, plus the other parts above.

This table covers the gaskets that seal the Water Inlet. 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 2003 Honda Civic — AJUSA 00962300.

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 2003 Honda Civic come from 9 brands — SKP, BECK/ARNLEY, FVP and 6 other brands. The "Popular" part is SKP SK1351520.

The Economy section: 5 options from SKP, BECK/ARNLEY, FVP and 2 other brands. SKP SK1351520 is listed in this group.

Standard Replacement: 4 parts, from AISIN, DAYCO, GATES and 1 other brand. A representative part number is AISIN WPH060.

Listed part numbers: SKP SK1351520, BECK/ARNLEY 1312283 and FVP US9434, 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

5 Water Pump Gasket parts are listed for the 2003 Honda Civic, from FEL-PRO, APEX, BECK/ARNLEY and 2 other brands. FEL-PRO 35738 carries the "Popular" badge.

Part numbers include FEL-PRO 35738, APEX AWP3183 and BECK/ARNLEY 0394176, among others listed above.

This table covers the Water Pump Seal 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

This group shows a single part: ELRING 634850.