1998 Honda Odyssey Owner's Manual - Page 178

Cooling System 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. DRAIN BOLT DRAIN PLUG 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. 3. Loosen the drain plug on the bottom of the radiator. The coolant will drain through the splash guard. Remove the drain bolt and washer from the engine block. CONTINUED Maintenance