Honda Civic Service Manual: Engine Cooling

Engine

...

Coolant Replacement (R18A9)

1. Radiator Cap 1. Wait until the engine is cool, then carefully remove the radiator cap. ...

See also:

Honda Civic Owners Manual. Using the Remote Transmitter
Locking the doors Press the lock button. Once: Some exterior lights flash, all the doors and fuel fill door lock, and the security system sets. Twice (within five seconds after the first push): The beeper sounds and verifies the security system is set. Using the Remote Tra ...