should be on right side, front of engine. at upper radiater hose, if not there check the thermostat housing!! on the 3.1 it is located by the ignition control module.
The 95 Lumina with a 3.1 engine does not have a temperature sending unit. Instead, the dash temp gauge is controlled by the engine coolant temp sensor. This sensor is located on the driver's side, top of the engine.
The temperature sensor is located in the thermostat housing which is on the drivers side of engine, behind the throttle body near the top of the engine
The temperature sensor is located is located next to the thermostat in the engine block. It is on the driver side of the engine compartment.
the back
The 1999 Chevy Lumina 3.1 liter engine crankshaft position sensor is located on the back of the crankshaft. A diagram can be obtained from most Chevrolet dealerships.
There is not a camshaft sensor on the '93 3.1 Lumina, just a crank sensor on the back side of the engine between the block and the barrel of the transaxle. Easy enough to get to from underneath the car.
The water temperature sensor is located on the front of the engine. You will find the sensor behind the thermostat housing.
The temperature sensor for the coolant system is located on the front of the engine. The exact location of the coolant temperature sensor is dependent upon the year of the engine.
The temperature sensor on a 2004 Neon 2.0 engine is located on the driver side of the engine below the cam sensor.
The engine coolant temperature sensor is located at the timing belt end of the engine on the water outlet casting.
The crankshaft sensor is located on the lower part of the engine closest to the firewall, on the passenger side of the car.
The knock sensor, in your 1997 Chevrolet Lumina, can be found on the front of the engine. The knock sensor is near the top of the engine.