Early 09 Honda civics (exc Hybrid, SI Models) may exhibit coolant looks at the engine block and be covered under Honda Warranty. As long as it has been less than 8 years you should be covered.
Steps to take:
1. Look for coolant leaking from the engine block cracks typically behind the engine oil/separator.
2. Pressure test the coolant system via the radiator and pinpoint to confirm.
Honda TSB 08-44 Information:
http://forums.consumerreports.org/discussions/Maintenance_and_Repair/Discussions/Honda_TSB_Number_08044/carsmaintenance/3593.1?redirCnt=1