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 the Saturn Sl2 will turn over but not start, check for ignition fire first. If there is no fire then look at the crank shaft sensor and coil pack as possible problem areas.
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
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.
There is no cabin air filter
my 1995 Saturn sl2 has a factory alarm, my daughters 1997 sc1 also has one
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.
Disconnect the battery for about 20 seconds.
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.