I have a leak that I can't seem to find that's causing me to lose coolant, it seems to be coming from the passenger side of the vehicle toward the back but when i jacked up the car I couldn't see exactly where it was coming from.

I have a 2008 Chevy Impala LS

 

I had the same issue with my 2000 Impala. The coolant leak was from the thermostat cover/gasket which happens to be on the drivers. The coolant leak ran along the back side of the engine toward the passenger side then hit the ground. If you haven't fixed it yet, then take a look at your thermostat.