1993 Pontiac Bonneville Owner's Manual - Page 204

If No Steam is Coming from Your Engine: If you get the overheat warning butsee or hear no steam, the problemmay not be too serious. Sometimes the engine can get 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 get the overheat warning withno sign of steam, try this for a minute or so: 1 Turn off your air conditioner. 2. Turn your heater to full hot at the highest blower speed andopen the window as necessary. 3.If you're in atraffic jam, shift to N (Neutral). If you no longer havethe overheat warning, you can drive. Just to be safe, drive slower for about ten 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 two or three minutes while you're parked, to see if the warning stops. . But then, if you still have the warning, TURN OFF THE ENGINE AND GET EVERYONE OUT OF THE VEHICLE until it cools down. You may decide not to lift the hood but to getservice help right away. 203