Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 66 (COOLING SYSTEM)THERMOSTAT TEST
2002 Honda Civic Si
Thermostat Test
2002 Honda Civic SiSECTION Thermostat Test
WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
Replace the thermostat if it is open at room temperature.
To test a closed thermostat:
- Suspend the thermostat (A) in a container of water. Do not let the thermometer (B) touch the bottom of the hot container.
- Heat the water and check the temperature with a thermometer. Check the temperature at which the thermostat first opens, and at which it is fully open.
- Measure the lift height of the thermostat when it is fully open.
Standard Thermostat
- Lift Height: Above 10.0 mm (0.39 in.)
- Starts Opening: 169-176°F (76-80°C)
- Fully Open: 194°F (90°C)
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.