Where is s 96 Saturn sl1 coolant temperature sensor?

Everyone should have a manual for their vehicle, and the library should have a professional shop manual available, for FREE, in the reference section(make copies of the correct sections) read up and fix it like a PRO! To paraphrase what Dave just said, " I don't know, get a book."

My part of this answer is this..... This location is described as being on the drivers side of the cylinder block. The Haynes manual shows two similar devices. One with a single wire the other with two wires. The single wire sensor in the Haynes picture is located directly next to the water hose on the top of the block on the drivers side.

The two wire sensor is about four inches from the same hose towards the cab as shown in the picture.

Make special note of this: On 1991-95 Saturn models, two coolant temperature sensors are utilized. Be careful not to confuse the single-wired coolant temperature sender used by the instrument cluster temperature gauge (which is covered in Section 2) with the 2-wired sensor used by the PCM. On 1996-98 Saturn models, only one 2-wired sensor is used to perform both functions Be certain the engine is cold before removal. The coolant is in direct contact with the sensor and will begin to pour out when the sensor is removed. You may notice that there is a white cap where the wires go in the top of the two wire sensor. DO NOT REMOVE THE WHITE CAP! This is a strain relief and will weaken the connection if removed.

Take a flat screw driver and approach from the top. Get between the block and the sensor and it will pop off nicely. Then use a deep well socket to remove. When replacing, use pipe dope or Teflon tape on the threads. Do not over tighten, when the unit begins to bind, your done. You will see in the sensor and on the wire connector that it is keyed. There is no polarity, so don't worry about witch way it goes on. Lightly place the connector on to the sensor and slightly twist until you feel it fall into place. Then push in to get the snap.