Question about 1999 Buick Century

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How to reset low coolant sensor on 1999 buick century

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Your cooling sensor is in the white plastic coolant tank that is on your firwall under the hood. If you fill it with coolant and the light continues to stay on. try and slap it a few times and see if that resets it. it could be gunked up. if that doesnt work fill the tank with radiator flush and let it sit for a little while and then flush the tank and refill with coolant.

Posted on Oct 19, 2010

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Posted on Jan 02, 2017

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I have a 2001 Century Buick and my low coolant light keeps coming on, although I have coolant in my tank. I have also changed the sensor recently. What could be the problem?


Hi!!
You may have air in the system. There should be a bleeding valve on top of the thermostat housing, where the upper radiator hose connects to the engine. Look in your owner's manual for the procedure to bleed air from your cooling system.
As long as the temp. gauge shows normal readings, you should not worry about any damage to the engine. Once the system has been bled, take the vehicle to an AutoZone or similar auto parts store to get the Low Coolant light reset, or, wait until it resets itself.
Good Luck! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa!!

Mar 03, 2011 | 2001 Buick Century

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The low coolant light is always on in my 2002 Buick Century. The rad was flushed as well as the overflow container and the coolant level never drops. The needle of temperature gage is always at the mid...


if the sensor was changed, the wiring to the sensor has to have a break in it somewhere. check for power and ground at your connector, and start tracing back to find the break. good luck!

Oct 25, 2010 | 2002 Buick Century

1 Answer

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IF THIS THE LOW COOLANT LIGHT THE THE SENSOR IN RESAVOR MAY BE BAD BUT IF IS THE COOLANT SENSOR LIGHT VW HAD ISUSSE WITH THIS SENSORN REPLACE SENSOR BUT THESE CAR ARE HARD TO GET AIR OUT OF SYSTEM ANY AIR CAN COUSE THIS HOPE THIS HELPS

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u need to buy the special coolant to your car i have the same car whit the same problem and is cause to the incorrent cooland the cooland to your car is the  DEX-COOL  if u dont find that u need some hit       (silicate-free) 

Apr 29, 2009 | 1999 Buick Century

1 Answer

Buick 1999 century replaced the sensor light and still comes on.


your buick century has a low coolant level sensor located in the passenger side of the radiator , sometiomes the sensor get covered with coolant sludge and will show that the cooling system is not filled , sometime the radiator is just still low on coolant . check the radiator when the engine is cold ( IF HOT WAIT !!! 30 mins ) and make sure the level is above the sensor.

Feb 06, 2009 | 1999 Buick Century

1 Answer

1999 buick century


is there coolant in the system ? if there is go to the coolant bottle there is a sensor in the bottom of that bottle if there is any thing beside coolant in that bottle it will cause the sensor to act erraticly. if there is no coolant our low coolant then the sensor is working you need to look for a leak

Feb 06, 2009 | 1999 Buick Century

1 Answer

Low coolant light


In the surge tank, there is a sensor that detects the level of the coolant. It's most likely the sensor is stuck on the low position. All this sensor does is slide up and down as the coolant level goes up and down. You can tap the side of the surge tank near where the sensor plugs in and see if it will dislodge. You'll see the 2 wire plug at the bottom of the tank towards the front.

Jun 13, 2008 | 1992 Buick Century

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