1999 Honda Odyssey Owner's Manual - Page 298

If Your Engine Overheats The pointer of your vehicle's temperature gauge should stay in the midrange under most conditions. It may go higher if you are driving up a long steep hill on a very hot day. If it climbs to the red mark, you should determine the reason. Your vehicle can overheat for several reasons, such as lack of coolant or a mechanical problem. The only indication may be the temperature gauge climbing to or above the red mark. Or you may see steam or spray coming from under the hood. In either case, you should take immediate action. 1. Safely pull to the side of the road. Put the transmission in Neutral or Park and set the parking brake. Turn off the heating and cooling/ climate control system and all other accessories. Turn on the hazard warning indicators. 2. If you see steam and/or spray coining from under the hood, turn off the engine. 3. If you do not see steam or spray, leave the engine running and watch the temperature gauge. If the high heat is due to overloading (climbing a long, steep hill on a hot day with the A/C running, for example), the engine should start to cool down almost immediately. If it does, wait until the temperature gauge comes down to the midpoint then continue driving. CONTINUED NOTICE Driving with the temperature gauge pointer at the red mark can cause serious damage to your engine. Steam and spray from an overheated engine can seriously scald you. Do not open the hood if steam is coming out. Taking Care of the Unexpected