The temp sending unit for the temp gauge is located on the drivers side of the engine between cylinders 3 and 5 spark plugs.
In most cases the single wire sensor runs a temp gauge or temp light. The double wire sensor feeds info to the vehicle's computer and operates relays for the cooling fans. This may or may not be the case for your Saturn.
normally the gauge should be in the middle.(between hot and cold) that is concider operating temp.
It goes to the temp gauge which is usually screwed in the head between the manifold on the drivers side, or into the thermost housing on the intake manifold.
code 15 coolant temp sensor low temp indicated change cts sensor or test with multi meter
The temp sending unit on the engine could be unplugged or faulty.
Defective temperature sensor or bad gauge
Thermostat stuck open or no stat at all. Faulty temp sensor or Gauge.
Temp sensor for the gauge.
probably the sensor
THE temp sending unit 4 the inside gauge usally has 1 wire & the sending unit 4 the Computer has 2 wires.
Bad gauge and/or coolant temp sensor The coolant temp sensor doesn't control the gauge. There is a sensor in the head on the driver's side that controls the gauge. It is fairly easy to get to, probably one of the only things on a 4th gen. lol
The coolant gauge temp sensor is a one wire sensor located on the right rear of the engine block.
Defective temperature gauge or defective temperature sensor?
Could be you have a temp sensor for the ECM and a temp sender for the gauge. The gauge sender generally has one wire attached to it. The temp sensor generally has two wires attached to it. Perhaps you changed the wrong one.
Test gauge function with a mechanical gauge to get actual engine temp.
Under intake plenum... has a dry coolant temp. Sensor in the head on the left bank... calculates ambient, exhaust and head temp in order to determine coolant temp
operates the temperature gauge Activates the cooling fan