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 134 (COOLING SYSTEM)RADIATOR CAP TEST
2002 Honda Civic Si
Radiator Cap Test
2002 Honda Civic SiSECTION Radiator Cap Test
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the radiator cap (A), wet its seal with engine coolant, then install it on a commercially available pressure tester (B).
- Apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm2 , 13-18 psi).
- Check for a drop in pressure.
- If the pressure drops, replace the cap.
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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.