GM Service Manual Online
For 1990-2009 cars only

There is a coolant temperature gage on your vehicle's instrument panel. See Engine Coolant Temperature Gage .

In addition, ENGINE OVERHEATED STOP ENGINE, ENGINE OVERHEATED IDLE ENGINE, and a ENGINE POWER IS REDUCED message comes on in the Driver Information Center (DIC) on the instrument panel. See DIC Warnings and Messages .

If Steam Is Coming From Your Engine

Caution: Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood.

If you keep driving when the vehicles engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop the engine if it overheats, and get out of the vehicle until the engine is cool.

See Overheated Engine Protection Operating Mode for information on driving to a safe place in an emergency.

Notice: If the engine catches fire while driving with no coolant, the vehicle can be badly damaged. The costly repairs would not be covered by the vehicle warranty. See Overheated Engine Protection Operating Mode for information on driving to a safe place in an emergency.

If No Steam Is Coming From Your Engine

The ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE message, along with a low coolant condition, can indicate a serious problem.

If you get an engine overheat warning, but see or hear no steam, the problem may 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. See Towing a Trailer .

If you get the ENGINE OVERHEATED STOP ENGINE or the ENGINE OVERHEATED IDLE ENGINE message with no sign of steam, try this for a minute or so:

  1. If the vehicle has an air conditioner and it is on, turn it off.
  2. Turn on the heater to the highest temperature and at the highest fan speed and open the windows as necessary.
  3. In heavy traffic, let the engine idle in N (Neutral) while stopped. If it is safe to do so, pull off the road, shift to P (Park) or N (Neutral) and let the engine idle.

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, pull over, stop, and park your vehicle immediately.

If there is still no sign of steam and your vehicle has an engine-driven cooling fan, push down the accelerator until the engine speed is about twice as fast as normal idle speed for at least five minutes while parked.

If there is still no sign of steam and your vehicle has an electric cooling fan, idle the engine for five minutes while 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" later in this section.

You might decide not to lift the hood but to get service help right away.