1998 Buick LeSabre Owner's Manual - Page 226

If No Steam Is Coming From Your Engine If you get the overheat warning but see or hear no steam, the problem may not be too serious. Sometimes the engine canget a little too hot when you: Climb a long hill on a hot day. Stop after high-speed driving. Idle for long periods in traffic. Tow a trailer. If you no longer have the overheat warning, you can drive.Just to be safe, drive slower for about 10 minutes. If the warning doesn't come back on, you can drive normally. If the warning continues, pull over, stop, and park your vehicle right away. If there's still no sign of steam, you can idle the engine for twoor three minutes while you're parked, to see if the warning stops. But then, if you still have the warning, turn ofSthe engine and get everyone out of the vehicle until it cools down. If you get the overheat warning with no sign of steam, try this fora minute or so: 1. Turn off your air conditioner. 2. Turn on your heater to full hot at the highest fan speed and open the window as necessary. You may decide not to lift the hood but to get service help right away. 3. If you're in a traffic jam, shift to NEUTRAL(N); otherwise, shift to thehighest gear while driving -- AUTOMATIC OVERDRIVE (@)or THIRD (3). 5-14