1993 Buick Riviera Owner's Manual - Page 199

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 nosign of steam, you can idle the engine for two or three minutes whileyou're parked, tosee if the warning stops. But then, you still have the if warning, TURN OFF THE ENGINE AND GET EVERYONE OUT OF THE VEHICLE until it cools down. the You may decide not to lift hood but to get service help right away. 197