2002 Deville Coolant Temp Sensor

My service engine light came on and the code is P0128 which is Coolant Temp Sensor, but no one can tell me where it is located on the Northstar engine. Does anyone know where it is and is it something that I can change?

I don't have my service manual right handy to look it up, but it's probably near the intake manifold. I would call a dealer and speak with someone in the service department, they should be able to tell you.