Civic L4-1.7L CNG (2003)
Coolant: Service and Repair
Replacement
1. Start the engine. Set the heater temperature control dial to maximum heat, then turn off the ignition switch. Make sure the engine and radiator are
cool to the touch.
2. Make sure you have the anti-theft code for the radio, then write down the frequencies for the radio's preset buttons.
3. Remove the battery.
4. Remove the radiator cap.
5. Loosen the drain plug (A), and drain the coolant.
6. Remove the drain bolt (A) from the rear of the cylinder block.
7. After the coolant has drained, apply liquid gasket to the drain bolt threads, then reinstall the bolt with a new washer and tighten it securely.
8. Tighten the radiator drain plug securely.