2001 Buick Regal Owner's Manual - Page 141

Low Coolant Warning Light If the LOW COOLANT light comes on, your system is low on coolant and the engine may overheat. See "Engine Coolant" in the Index and have your vehicle serviced as soon as you can. The light will come on briefly when your ignition is turned on to show you that it is working properly. Low Tire Light The low tire inflation monitor system can alert you to a large change in the pressure in one tire. After the system has "learned" tire pressures with properly inflated tires, the LOW TIRE light will come on if the pressure in one tire becomes 12 psi (83 kPa) lower than the other three tires. The low tire inflation monitor system won't alert you if the pressure in more than one tire is low, if the system is not yet calibrated, or if the vehicle is moving faster than 70 mph (110 km/h). When the LOW TIRE light comes on, you should stop as soon as you can and check all your tires for damage. (If a tire is flat, see "If a Tire Goes Flat" in the Index.) Also check the tire pressure in all four tires as soon as you can. See "Inflation - Tire Pressure" in the Index. The light will stay on (while the ignition is on) until you reset (calibrate) the system. See "Low Tire Inflation Monitor System" in the Index. 2-72