There is a sensor in the reservior that will sometimes act up. If the coolant is full try tapping on the sensor lightly and see if that changes the warning light. This is the likely problem source.AnswerNot sure but yours should be the same. My wifes 95 lumina was doing the same thing. On the thermostat housing, there should be a small screw that you need to back out a bit until antifreeze comes out. I have been told that air gets trapped in that specific spot and it causes the low coolant light to come on.
The sensor is located above the thermostat .. right where the upper radiator hose connects to the intake manifold .. theres also a bleeder screw on the coolant rail that's located right by the belt next to the front valve cover run the car for a while then shut it off then open both of those bleeder screw to alow the air pockets to get out .. if your loosing coolant and having alot of air pockets its possible your head gaskets are going bad...
Remove the air intake runner at the throttle body. Follow the upper radiator hose to the engine hose neck. Behind the hose neck is the sensor. Remove the plug (wires) and unscrew the sensor. Replace with new sensor, if you're quick you'll lose minimal coolant. Replace the plug to the sensor. Reassemble the air intake runner. Start the engine , let it warm to operating temperature and check for leaks. Top up coolant as required.
Remove brace to better access the coolant area. Unplug and remove the battery. Remove the electrical connector from the sensor. Have container beneath vehicle to catch any coolant. Remove the wire, or wires, that are holding the senor in place. Add antifreeze to the O rings and push the new sensor into place. Replace the battery and brace cover.
The engine coolant temperature sensor has nothing to do with the low coolant light. The low coolant sensor is mounted in the bottom of the overflow/filling reservoir by your washer fluid bottle. You will need to verify that the coolant overflow/fill bottle has coolant in it and if it does then the sensor is bad and will have to be replaced.
NOTE: this answer is describing the location of the engine coolant temperature sensor - NOT the coolant sensor in the reservoir that warns when the level gets too low.The coolant temperature sensor is located directly adjacent to the thermostat housing. The thermostat housing is what the upper radiator hose (toward the right side of the engine compartment) connects to. You do not have to replace the reservoir to replace this part, but leaky coolant reservoirs are a common problem on this model.
,I have to replace my sensor too, The coolant sensor is located on the side of the Radiator, NOT the plastic coolant overflow bottle, as one would expect. You might want to drain the coolant down a little so when you take out the sensor, you don't make a mess. I think the sensor on these are around $40.00TomTom4049Just bought the coolant level sensor at AutoZone for $6.99, that's pretty cheap folks. This one is for a 1999 Cavalier with the 2.2, yours may vary slightly.I have a buddy who is non-mechanical when it comes to his car. Funny but he was a aircraft maintenance mechanic is the Air Force! I find that an odd juxtaposition. I will replace his sensor, flush and change the oil, oil filter, air filter, and replace the coolant, and install new plugs. He's a little short on funds so I bought everything myself. Everyone needs a friend like me.
coolant temperature sensor are located where the coolant runs in the block near the thermostat housing normally the connector are on top of the sensor and the sensor itself screws in with a deep socket. The temperature sensor is usaully located where the coolant runs OUT of the engine close to thermostat housing.
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