Question about 1998 Buick Century

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Trying to locate the "low coolant sensor" on a 1998 Buick Century Custom, 6 cyl. Also, does the battery need to be pulled to get to the sensor? Last question, with engine cool, how full should the overflow resevoir be?

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Its located at the bottom of the coolant reservoir.

Posted on Oct 01, 2010

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Where is low side port to connect charge kit on a 1998 Buick Century Custom? Also, to be sure what type of refrigerant should be used? (R-134a) or different Thank You, Brandon


1998 Buick Century is factory-equipped with R134a refrigerent.

As for the service port, you just have to look for it. Not even the factory service manual will tell you exactly where it is located. It will be either on the accumulator itself or in the low pressure line between the accumulator and the compressor. (see diagram)

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Change the low coolant sensor. It is located on the radiator. It might be a good idea to get the radiator flushed too.

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did you mean coolant level indicator module, it is located on the right inner part of the radiator

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it sounds like you have low compression on cyl 5 might be bent valve.

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If you have the 4 cyl, look in upper engine area, end of valve cover, mounted in front side of water outlet.
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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.

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1 Answer

How to replace a coolant level sensor, 2000 buick century


The coolant level sensor is located on the radiator. If you are looking at the engine from the front of the car it will be on the left side. There will some kind of clip holding it in the radiator. Removed the clip and pull the sensor out. You will lose coolant so try to swap it out quick or drain some of the coolant out. Once new sensor is installed, install clip to keep the sensor in place and reconnect the wires to the sensor. Crank the engine and make sure the coolant level is full. This should correct your problem.

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