1997 GMC Sonoma Owner's Manual - Page 107

Anti-Lock Brake System Warning Light With the anti-lock brake system, this light will come on when you start your engine and maystay on for several seconds. That's normal. Engine Coolant Temperature Gage This gage shows the engine coolant temperature. If the gage pointer moves into the red area, your engine is too hot! ANTI - LOCK If the light stays on, or comes on when you're driving, your vehicle needs service. If the regular brake system warning light isn't on, you still have brakes, but you don't have anti-lock brakes. If the regular brake system warning light is also on, you don't have anti-lock brakes and there's a problem with your regular brakes. See "Brake System Warning Light" earlierin this section. The anti-lock brake system warning light should come on briefly when you turn the ignition key to RUN. If the light doesn't come on then, have it fixed so it will be ready to warn you if there is a problem. It means that your engine coolanthas overheated. If you have been operating your vehicle under normal driving conditions, you should pull off the road, stop your vehicle and turn off the engine assoon as possible. In "Problems on the Road," this manual shows you what to do. See "Engine Overheating" in the Index. 2-59