Honda Civic Service Manual: Thermostat

Water Passage Removal and Installation (K24Z7)

1211F4 1. Radiator Cap 1. Wait until the engine is cool, then carefully remove the radiator cap. ...

Thermostat Housing Removal and Installation (R18A9)

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

See also:

Honda Civic Owners Manual. Reporting Safety Defects
In the U.S. If you believe that your vehicle has a defect which could cause a crash or could cause injury or death, you should immediately inform the National Highway Traffic Safety Administration (NHTSA) in addition to notifying American Honda Motor Co., Inc. If NHTSA receives similar c ...