Where is the thermostate sensor for a 1999 Chevy Tahoe?

The thermostat sensor is located on the top of the thermostat which is located directly on top of the intake, on the front of the engine, connected to your top radiator hose. Hope this helps, Brenda The thermostat sensor is located on the top of the thermostat which is located directly on top of the intake, on the front of the engine, connected to your top radiator hose. Hope this helps, Brenda