2005 Buick Park Avenue Owner's Manual - Page 260

If you no longer have the overheat warning, you can drive. Just to be safe, drive slower for about 10 minutes. If the warning does not come back on, you can drive normally. If the warning continues and you have not stopped, pull over, stop, and park your vehicle right away. If there is still no sign of steam, you can idle the engine for three minutes while you are parked. 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 get service help right away. Cooling System When you decide it is safe to lift the hood, here is what you will see: 3800 (L36) engine shown, 3800 Supercharged (L67) engine similar A. Radiator Pressure Cap B. Electric Engine Cooling Fans C. Coolant Recovery Tank 5-28