My 98 Cavalier overheated the other day so we stopped on the side of the road to let it cool down but when we tried starting it up again it wouldn't. So we towed it back home to check it. It seems that there is anti-freeze and engine oil mixed everywhere.

You have to find out what stopped working , ignition system , fuel pump , engine malfunction etc.... Videos on youtube showing how to test these thing's . No Start Diagnostic Basics EricTheCarGuy

There is a black fuel relay way up under the top left driver side dash that breaks its main wire solder connections on the circuit board under over-heat conditions. Resolder that relay. Starting fluid will show that you have lost fuel delivery under no start conditions. You can use the breather hose from the valve cover for this test.

I encountered a similar problem on a chev 4cyl with a coil pack ignition ( no distributor). It would run for a while and suddenly die out and wouldn't restart until a 10 to 20 min. cooling period. It turned out to be a crankshaft position sensor going bad. On this engine it was located in the engine block under the ignition module on the firewall side.

is the car running hot? some cooling fans never come on going down the road because the air comjng through the front of the vehicle keeps the car cool enough that it doesn't need to come on. but if it is overheating then you may want to check the cooling fan relay.

GET THAT COOLANT SENSOR CHECKED

Check for the cooling fans working or not,also the thermostat,it can be stuck,and the coolant level maybe dropping and getting air in the system.

you could try replacing your fuel filter its cheap and easy.

try changeing the coolent senser

you need to find the fuel pressure release around the fuel rail press the little tab when the car dies. If there is no fuel coming out from that point, your fuel pump is going.