181+ 2003 Honda Civic Cooling System Si Parts - Page 4

Si · Cooling System (153 products)

Exact-fit parts for the 2003 Honda Civic Si.

Dorman

Part # 902-5016

Fits with Conditions

Engine Coolant Thermostat Housing

$14.85

Radiator Fan Assembly Without Controller

Dorman

Part # 620-220

Fits with Conditions

Radiator Fan Assembly Without Controller

$60.61

Onix

Part # OR2354

Fits with Conditions

Radiator

$79.08

Nissens

Part # 940162

Fits with Conditions

Air Conditioning Condenser

$106.76

Collision

Part # HO3115115

Fits with Conditions

Engine Cooling Fan Assembly

$69.13

Graf

Part # PA970

Fits with Conditions

Water Pump

$64.26

Four Seasons

Part # 75750

Fits with Conditions

2 Pole Radiator Fan Motor

$68.72

Four Seasons

Part # 85979

Fits with Conditions

Water Outlet with Thermostat

$48.61

Dorman

Part # 902-117

Fits with Conditions

Engine Coolant Thermostat Housing

$40.48

Gates

Part # 19488

Confirmed Fit

Gates 02-05 Honda Civic 4-Cyl. 2.0L Heater To Valve Molded Heater Hose

$8.12

Motorad

Part # 2042-170

Fits with Conditions

High Flow Thermostat-170 Degrees

$9.75

Denso

Part # 477-0630

Fits with Conditions

Air Conditioning Condenser

$97.08

Denso

Part # 221-3220

Fits with Conditions

Radiator

$114.98

Collision

Part # HO1225127

Fits with Conditions

Radiator Support

$72.50

Mishimoto

Part # MMTS-RSX-02

Confirmed Fit

Mishimoto 02-06 Acura RSX 60 Degree Racing Thermostat

$92.11

Aisin

Part # THH-016

Fits with Conditions

Engine Coolant Thermostat Assembly

$21.35

Motorad

Part # 2328-170

Fits with Conditions

High Flow Thermostat-170 Degrees

$13.08

Timing Belt Kit With Water Pump - Standard Series

ContiTech

Part # CK312LK1

Fits with Conditions

Timing Belt Kit With Water Pump - Standard Series

$128.38

Designed to transfer glycol-based coolant throughout the vehicle's cooling system. The EPDM tube and cover and the synthetic reinforcement meets or exceeds SAE 20R4EC Class D1 specifications. Exact OEM configuration ensures a perfect fit.

ContiTech

Part # 62504

Fits with Conditions

Designed to transfer glycol-based coolant throughout the vehicle's cooling system. The EPDM tube and cover and the synthetic reinforcement meets or exceeds SAE 20R4EC Class D1 specifications. Exact OEM configuration ensures a perfect fit.

$17.22

Motorad

Part # 5328-170

Fits with Conditions

UltraStat Thermostat-170 Degrees

$19.31

Frequently Asked Questions

Do these parts fit my 2003 Honda Civic Si?

This page groups parts listed for the 2003 Honda Civic Si. Some products fit every trim, while others depend on submodel, engine, drivetrain, or brake package. Use your trim in My Garage or the product page fitment check to confirm exact fit.

What cooling system options are available for my 2003 Honda Civic Si?

We offer a wide selection of cooling system parts for the 2003 Honda Civic Si. This page narrows the catalog to the year, make, and model; use your trim on product pages to confirm exact fit when a part only fits certain submodels.

What brands make parts for the 2003 Honda Civic Si?

We carry parts from trusted brands including Four Seasons, Motorad, Gates, Dayco, and Fel-Pro, plus many more. Filter by brand to find your preferred manufacturer.

How fast do 2003 Honda Civic Si parts ship?

Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.

What warranty do your 2003 Honda Civic Si parts come with?

Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.

2003 Honda Civic(3,301 parts)

2003 Honda Civic(3,301 parts)

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Other Honda Civic Years

Si · Cooling System (153 products)

Engine Coolant Thermostat Housing

Radiator Fan Assembly Without Controller

Radiator

Air Conditioning Condenser

Engine Cooling Fan Assembly

Water Pump

2 Pole Radiator Fan Motor

Water Outlet with Thermostat

Engine Coolant Thermostat Housing

Gates 02-05 Honda Civic 4-Cyl. 2.0L Heater To Valve Molded Heater Hose

High Flow Thermostat-170 Degrees

Air Conditioning Condenser

Radiator

Radiator Support

Mishimoto 02-06 Acura RSX 60 Degree Racing Thermostat

Engine Coolant Thermostat Assembly

High Flow Thermostat-170 Degrees

Timing Belt Kit With Water Pump - Standard Series

Designed to transfer glycol-based coolant throughout the vehicle's cooling system. The EPDM tube and cover and the synthetic reinforcement meets or exceeds SAE 20R4EC Class D1 specifications. Exact OEM configuration ensures a perfect fit.

UltraStat Thermostat-170 Degrees

Frequently Asked Questions

Do these parts fit my 2003 Honda Civic Si?

What cooling system options are available for my 2003 Honda Civic Si?

What brands make parts for the 2003 Honda Civic Si?

How fast do 2003 Honda Civic Si parts ship?

What warranty do your 2003 Honda Civic Si parts come with?