96 SL1 sucking in all anitfreeze and battery light coming on

SOHC, check oil for coolant contamination. Pressure test cooling system.

Fan comes on at roughly the 3/4 mark. How have you not over heated it.

Clean battery connections, test alternator at autozone or something...

i drive with the heat on all the time. there is no anit freeze in the oil tank and no leaks.

Check the fan itself. Disconnect it and run power directly to it using jumper wires to ensure it does work. Some cars have a thermal switch near the thermostat or at the bottom of the radiator that triggers the fan relay (make sure you have the right one). Unplug the thermal switch and jumper the two wires in the connector. If the thermal switch connector has only one wire, then ground it to test. If the fan runs then the switch is bad. If the fan still does not run then the fan relay could be faulty. To troubleshoot it further you will need a wiring schematic.

Explain please exactly what "sucking in all the antifreeze" means?

If the fan does not run, then it is more likely you are overheating and the coolant is going out the overflow tube from the reservoir. It would then suction back the remaining coolant into the engine block while it cooled, and yes, it could have too little left to stay at the full cold line.

Find the source of the fan not running first. The fan is turned on by the CPU based on voltage received from the Coolant Temperature Sensor (CTS), which is a known weak point in the Saturn engine. The CPU then activates the fan relay which turns on the fan. A little diagnostic work should tell you the source of this problem.

Bob