2001 Saturn Sedan 01 Saturn doesn't start

Here's what I need you to do when it crank's but no start I need you to take off two spark plug wire's off the coil's that are right next to each other. Then have someone crank the engine while you watch for spark jumping from post to post. Let me know if you have spark when it doesn't start. Sound's like you have a bad crank shaft sensor there about 20. But untill we do a few test's I can't tell you for sure.

It can do all that but most of the time it will just stall out and not start. Or it will run fine fine till you go to the store and come out and no start.

On your car most of the time it won't set a code if the crank sensor is bad.Your last symptom you described that could be a bad coolant temp sensor.They cause all kind's of problems no start's stall's overheating and you wouldn't know it because the gauge will read lower then normal because the coolant temp sensor's end up reading like 30-40 degree's below actual temp.Very common for them to go bad.There only 10 if you change it make sure you get a brass tipped one the plastic tipped one's crack.Also i would inspect the connector going to it if it's corroded it will have to be replaced as well.I know your next question will be where is the coolant temp sensor so i posted a diagram of where it is.Also if you change it make sure the engine is cold and you will loose coolant.

Alright let me know how it goes.