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The reason why Saturn S-Series are notorious for having false reading coolant temperature gauges is because of a design flaw. The sensor itself on the early S-Series is made out of a resin. Over time that resin after many heating and cooling cycles, it begins to absorb coolant and/or crack. Basically depending on the year of your SL1 (any S-Series for that matter), it will have a temp sensor that should be replaced. The aftermarket makers of the part have made them in such a way that they are no longer a resin tip, but instead a brass tip. This design is less susceptible to failure and is superior.
F.Y.I
1) 1991-1995 S-Series have two sensors. They are located on the drivers side of the cylinder head below the radiator hose. On the 1991-1995 the sensor which gives information to the gauge in the instrument cluster is the sensor closest to the front of the car (it will have a 1-wire connection). On 1996 and up S-Series, there is just one sensor and it handles the duty of sending the computer a signal as well as the instrument cluster.
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