Leaking engine antifreeze, need to find out hwere the leak is. Top up the anitfreeze 50/50 water mixture, so that it won't over heat. You may see white smoke when driving if the leak is bad and the coolant sprays on the block. Thats a pretty critical problem, get it to the dealer/mechanic ASAP.

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2007 Jeep SRT-8 (going to be supercharged)
2007 Trailblazer SS
2003 X5 4.6is ESS supercharged
2004 Silverado SS supercharged
2005 Escalade supercharged
2003 Corvette ZO6 supercharged
1999 Mercedes S600