Cooling System - Pontiac 2004 Grand Prix Owner's Manual

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, and you have not stopped,
pull over, stop, and park your vehicle right away.
If there's still no sign of steam, you can idle the engine
for three minutes while you're parked. If you still
have the warning, turn off the engine and get everyone
out of the vehicle until it cools down. Also, see
"Overheated Engine Protection Operating Mode" listed
previously in this section.
You may decide not to lift the hood but to get service
help right away.
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Cooling System

When you decide it's safe to lift the hood, here's what
you'll see:
3800 V6 Engine