2002 Cavalier 2.2 Low Coolant Light

[Scottm69s]

I have a 2002 Cavalier 2.2l 4cy. stick shift. Yesterday i changed the thermostat, filled the coolant and it started running hot and the Low Coolant Light turned on. I purchased another thermostat and replaced it. Then I found the bleeder screw and could not get any fluid to come up. The engine was still running at about 195 degrees and the low coolant light was still on. I then purchased the sensor for inside the coolant tank and replaced it. Turned the bleeder screw until fluid came out this time. Still having the same problem with the Low Coolant Light. Its hard to see the level of fluid on the side of the tank but it looks close to the cold line. Does anyone know what i should do next?