91 Grand Am cooling problems

Greetings !

I just purchased a 91 Grand Am with the Quad 4. My question is I am running out of coolant every other day. I have no leaks as there are no puddles underneath ever. But my fan never comes on. What would be the cause of this ? I don't know a whole lot about cars so if this is a simple question go easy on me :p

Thanks .

I'm not sure, but you might want to check the coolant cap, if it's loose, you may be evaporating all the coolant out...also, are you mixing the coolant with water before putting it in...Straight coolant is hard on the system, and you might want to check out the fan too...