Open radiator cap and slowly put coolant in top(with car off and cold), fill till the fluid comes to top and let set for a minuite and continue to to fill till full, then start car with cap off and run till guage comes up half way and then guage will come down quarter way and have hot air running on high and feel the temp of air till its hot and then check level in radiator , then put cap back on and fill the resivore to the line it shows.if it was real low then you have a leak somewhere or internal leaks , whitch needs further diagnosis.
Remove winged large cap in front of engine fan on top of big tank (just behind front grille of car at top). Smell the odor from the tank--should be a sweet smell. If you can see the liquid down lower--it is usually a greenish color--but not always. Fill to 1 inch below the tank neck/ or small overflow hole in neck of tank. Replace 2 stage cap.
SOURCE: 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.
SOURCE: Heater/AC Fan does not work in our 1998 Buick Century
Fan will be under dash on passengers side , Removing glove box might be needed, Gm also uses a blower resister ro control fan speeds. First check your fuse and then check and make sure your getting 12 volts to the terminal at the blower, You could have a blown fuse, a bad switch, or a bad resister , if your getting voltage to blower motor then most likely it will be the motor. These are not to difficult to change. I hope this helps, please be aware I can only guess at what the problem is from my past experience.
SOURCE: 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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