Honda 1990 Civic Sedan Owner's Manual page 82

Main Menu
Cooling System (cont'd)
1 .Turn the heater temperature control dial to maximum heat.
2. Remove the radiator cap, splash shield and drain plug when the
radiator is cool, and drain the radiator.
DRAIN PLUG
3. Remove the drain bolt from the
front side of the cylinder block,
and drain the engine and heater.
4. Apply non-hardening sealant to
the drain bolt threads, then
reinstall the bolt and tighten it
securely.
5. Tighten the radiator drain plug
securely.
6. Mix the recommended antifreeze
with an equal amount of low-
mineral or distilled water and fill
the reservoir to maximum, as
illustrated.
7. Loosen the air bleed bolt in the thermostat housing, then fill the
radiator to the filler neck with the coolant mixture. Tighten the
bleed bolt as soon as coolant starts to run out in a steady stream
without bubbles.
8. With the radiator cap off, start the engine and let it run until
warmed up (fan goes on at least twice). Then, if necessary, add
more coolant mixture to bring the level back up to the filler neck.
9. Put the radiator cap on, then run the engine again and check for
leaks.
RADIATOR
CAP
BLEED BOLT
Fill to
MAX
here
FILLER
NECK
Fill to here
DRAIN BOLT