[Justpassingthrough]

I've got a 1984 Olds 98 Regency and I recently replaced the thermostat and thermostat housing (housing was leaking). Everything appeared to be working fine after I put it back together but now the low coolant light and buzzer is coming on continuously. Coolant level is fine and I've pulled the "gages" fuse to shut the buzzer off. My question is, where is the sensor located, how does it work and what might be causing it to run continously?