Honda 2003 Civic Si Owner's Manual page 173

Cooling System
4. Loosen the drain plug on the
bottom of the radiator. Drain the
coolant into an appropriate
container.
174
Maintenance
DRAIN PLUG
5. Disengage the holding clip at the
bottom of the reserve tank.
Remove the drain cap and install a
rubber hose. Drain the coolant
into an appropriate container.
6. When the coolant stops draining,
tighten the drain plug at the
bottom of the radiator.
7. Remove the rubber hose and
reinstall the drain cap securely.
DRAIN CAP
HOLDING CLIP
8. Tighten the drain cap with the
holding clip securely.
9. Put the cover back in place and
tighten the bolts securely.
Reinstall the nine holding-clips and
lock each clip in place by pushing
on its center.