Using a small wire brush or emery cloth, polish the low coolant level sensor ^ Light is on - Replace the low coolant sensor and re-checkĥ. Key on and the engine off, observe the low coolant light for at least 15 Sharp probe (3) attached to the ground wire, ground the coolant sensor probe Connect a ground wire (1) to the battery negative terminal. With the key off, connect the coolant level sensor into the vehicle's wiring ^ Light is on - Chassis wiring or instrument cluster concern.įollow the appropriate diagnostic information in SI.Ĥ. With the key on, the engine off and the coolant level sensor disconnectedįrom the vehicle wiring harness, observe the low coolant light: Refer to Coolant Level Module Replacementģ. If the low coolant light operates properly,ĭiagnose the cooling system for loss of coolant as outlined in SI. If the coolant is low, add proper amount of 50/50 Verify that the coolant is at proper level in the radiator and Flush cooling system only when instructed byġ. Discoloration of theĬoolant recovery bottle is normal and does not necessarily indicate thatĬoolant contamination is present. "aftermarket" over-the-counter sealing and cooling supplements mayĪffect the operation of the low coolant level sensor. Systems, other than what is approved and recommended by GM. Important: No coolant supplements should be used in GM cooling This film results inĪ false activation of the coolant level indicator.ĭiagnose low coolant level system operation and check the sensorįor oil contamination using the procedure listed below. Once in the coolant, the oil leavesĭeposits on the level sensor creating an insulating film. Possible sources of oil contamination are internalĮngine leaks, improper service procedures, or the addition of some types ofĪnti-leak additives to the cooling system. The cause of this condition may be due to engine oilĬontaminating the coolant. Some customers may comment that the low engine coolant level Operation/Check Sensor for Oil Contamination) Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Refer to Coolant Level Module Replacement in Engine Cooling. Replace the engine coolant level indicator module. Turn the ignition switch to the RUN position.Disconnect the engine coolant level indicator module connector.The engine coolant level indicator module is on the right side of the radiator just down below from the radiator cap ! The engine coolant level switch grounds the indicator with the coolant level in the coolant reservoir below the minimum recommended level. Flushing the coolant on a regular basis removes gunk and mineral deposits from your engine, while prolonging the life of your heater core, thermostat, hoses and water pump.Hi Tammie, Is the coolant level low ? If not , If you spill coolant when you flush your Century, be sure to put down cat litter to soak it up to discard it. The video above shows you where the petcock on your radiator is located, how to flush the coolant / antifreeze and how to burp the system to get the air out of your Century.Ĭoolant is toxic and animals are attracted to the sweet taste of coolant (antifreeze). When you flush your coolant, which is antifreeze, on your 1999, you are draining out all of the old dirty coolant and preventing costly radiator and cooling system repair down the road. Like the oil in your Century, coolant gets dirty over time and loses its ability to cool down your 3.1 liter engine. Turn off the engine and drain the water, fill up the radiator with antifreeze until you have a 50/50 coolant / distilled water mixture and burp the system. Fill up the radiator with distilled water and run the engine. This video shows where the radiator drain plug (petcock) is located on a 1999 Buick Century. Start your coolant flush by draining the coolant / antifreeze that is in your reservoir, then drain the coolant that is in your radiator by opening the petcock or removing the lower radiator hose. In addition to preventing your car from overheating, coolant / antifreeze also helps lubricate the seals in the water pump and hoses. Coolant / antifreeze also passes through the heater core under your cowl to provide heat to the cabin of your Century. Coolant / antifreeze circulates through Century radiator and engine to maintain the proper temperature. Learn how to flush the coolant (antifreeze) in your 1999 Buick Century.
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