1996 Buick Park Avenue Owner's Manual - Page 131

Low Coolant Warning Light When this light comes on, the cooling system is low on coolant. As a bulb check, it will come onwhen the ignition in the RUN position and then go off. Malfunction Indicator Lamp (Check Engine Light) Your Buick is equipped with a computer which monitors operation of the fuel, ignition and emission control systems. COOLANT LOW CHECK If the coolant level is low, the light will come back on. If this happens, see "Engine Coolant" in the Index for proper cooling system fill. After the coolant level is returned to its proper level, the LOW COOLANT light will go off after 20 seconds or remain off on the next ignition cycle. This system is called OBD I1 (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle,helping to produce a cleaner environment. (In Canada, OBD I1 is replaced by Enhanced Diagnostics.) The CHECK ENGINE light comes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before any problemis apparent, which may prevent more serious damage to your vehicle. This system is also designedto assist your service technician in correctly diagnosing any malfunction. 2-75