I'm having trouble with my 95 Z28

This mourning I started the car and the low antifreeze light pops on... I put some more anti freeze in it and took it out on the expressway, the car ran fine but the light was still on... got off and put some more antifreeze in. I checked for leaks and could find none. I drove around some more and the car still runs fine, checked the anti freeze again... all gone... put some more in... and checked for leaks... None found... the anti freeze light is still on.
What could be the problem here?

If the heads were cracked wouldn't white smoke come out the exaust?
And if the block was cracked wouldn't the car run crappy?..

Need help and open to all suggestions...
Thanks...

 

I also forgot to mention that the temperature gauge reads normal and the car is not over heating... we've also had some pretty cold weather lately last mourning it got down to 30 below 0...

 

When you add, I assume you add to the tank, right? check the radiator somethime (when cooled) if there is a lot in there, it could be your low coolant sensor, I guess they like to die a lot. You might check out a new radiator cap too, I'm not sure other than those. It's not leaking out of the weep hole in the water pump either is it?
Good luck whatever it is

 

prolly the sensor......

 

sever head gasket leak? Any oil in your antifreeze when there is some there?