Replace the engine coolant temperature sensor. Your car has two, replace the one with the 2 wire connector
Rather than fixing it yourself, you should take it to a professional.
If it is running ragged and eventually stops, it is because the engine idle is too high. It has an idle solonoid that controls the idle speed and sometimes you need to take it out of the throtle body and clean it, If it just idles smoothly as if you didn't turn the key off, it is probably the ignition switch which is on the steering column under the dash. Not where you insert the key. that is simply the lock mechanism.
6.5 all the way around
under the center console between the drier and passenger seats
Depending on where a person lives and where they have the repair done, the labor for replacing the starter on a 2000 Saturn SL2 will cost between $186 and $238. The cost for the parts will be $149 to $261 plus tax.
A 1995 Saturn SL2 will hold 7 quarts of coolant. Saturn vehicles are no longer made but can still be serviced by GMC dealerships.
Switch or cylinder?
== == In the fuel tank.
I am prettysure you can change the motor as long as the body structure is the same and you have skill in this sort of thing.
my 1995 Saturn sl2 has a factory alarm, my daughters 1997 sc1 also has one
Disconnect the battery for about 20 seconds.
It's .040
1993 Saturn sl2
Below and to the left of the steering column.
There is none.
I drove my 1995 Saturn sl2 until it had 263,000 miles on it. At that time, the transmission started to slip. I then gave it to a friend, to buy a newer Saturn sl1.
Under the dashboard, just next to the steering column.