GM Service Manual Online
For 1990-2009 cars only

There is a coolant temperature gage and a warning light on the instrument panel that indicate an overheated engine condition. See Engine Coolant Temperature Gage and Engine Coolant Temperature Warning Light .

If Steam Is Coming From Your Engine


Object Number: 812505  Size: B3

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. Just 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 your engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop your engine if it overheats, and get out of the vehicle until the engine is cool.

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

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

If No Steam is Coming From Your Engine

An overheat warning can indicate a serious problem.

If an engine overheat warning appears without seeing or hearing any steam coming from the engine, the problem may not be too serious. Sometimes the engine can get a little too hot when the vehicle:

    • Climbs a long hill on a hot day.
    • Stops after high-speed driving.
    • Idles for long periods in traffic.
    • Tows a trailer.

If an overheat warning occurs without any sign of steam, try this for a minute or so:

  1. In heavy traffic let the engine idle in NEUTRAL (N) while stopped. If it is safe to do so, pull off the road, shift to PARK (P) or NEUTRAL (N) and let the engine idle.
  2. Set the heater at the highest setting and the fan at the highest speed and open the windows as necessary.

If the overheat warning no longer exists, the vehicle can be driven. Just to be safe, drive slower for about 10 minutes. If the warning does not come back the vehicle can be driven normally.

If the warning continues, and the vehicle is not stopped, pull over, stop, and park the vehicle right away.

If there is still no sign of steam, idle the engine for three minutes while parked. If the warning is still there, 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.