1995 GMC Yukon Owner's Manual - Page 248

I NOTICE: If your engine catches fire because you keep driving with no coolant, your vehicle can badly damaged. The costly repairs be would not be coveredby your warranty. lf No Steam 1s Coming FromYour Engine If you get the overheat warning but see or hear no steam, the problem may not be too serious. Sometimesthe 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 "Driving on Grades" in the Index. If you get the overheat warning with no sign of steam, try this for a minute or so: 1. If you have an air conditioner, turn it off. 2. Turn on your heater to full hot at the highest fan speed and open the window as necessary. 3. If you're in a traffic jam, shift to NEUTRAL (N); otherwise, shift to the highest gearwhile driving - AUTOMATIC OVERDRIVE (0) or DRIVE (3) for automatic transmissions. If you no longer have the overheat warning, you can drive. Just to be safe, drive slower forabout ten minutes. If the warning doesn't come back on, you can drive normally. 5-10