Honda 1998 Prelude Owner's Manual page 178

Do not add any rust inhibitors or
other additives to your vehicle's
cooling system. They may not be
compatible with the coolant or
engine components.
Replacing Engine Coolant
The cooling system should be
completely drained and refilled with
new coolant according to the time
and distance recommendations in
the maintenance schedule. Only use
Genuine Honda antifreeze/coolant.
Draining the coolant requires access
to the underside of the vehicle.
Unless you have the tools and
knowledge, you should have this
maintenance done by a skilled
mechanic.
1. Slide the heater temperature
control lever to maximum heat.
Open the hood. Make sure the
engine and radiator are cool to the
touch.
2. Remove the radiator cap.
Cooling System
DRAIN PLUG
Type SH
3. Loosen the drain plug on the
bottom of the radiator. The
coolant will come out through the
hole in the splash cover.
Maintenance
CONTINUED