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 Service Manual. Front Door Opening Seal Removal and Installation
8351C0 DRIVER SIDE 8361B7 PASSENGER SIDE Removal 1. Front Door Sill Trim - 4-Door 1. Remove the cap (A) from the front door sill trim (B). ...