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Drain the radiator. The thermostat is in a housing connected to the water pump. Remove the housing to replace the thermostat and gasket.
Follow the upper radiator hose back to the engine, it is connected to the thermostat housing on the engine. The thermostat is located under the thermostat housing.
connected to thermostat housing
If it has a 4.3L engine the temp sensor is located next to the thermostat housing.
The 1992 Chevy 3500 temperature sensor is located on the front of the engine. The temperature sensor will be in the vicinity of the thermostat housing.
The 1995 Chevy Silverado coolant sensor is located on the front of the engine. The coolant sensor will be a few inches above the thermostat housing.
The temp sensor for the ECM (engine control module) is next to the thermostat housing.
It is located on the intake manifold near the thermostat housing.
slim near the thermostat housing with two wires on it
1983 Chevy 305 diagram, waterneck, thermostat housing and fittings
The themostat is located in the top rad hose on the engine side, but I don't know about the sensor. In my 91 the coolant temp sensor is in the thermostat housing and the engine temp sensor is on the block.
It is screewed into the intake manifold right beside the thermostat housing.