Coolant Weep Hole
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
For vehicles equipped with a 3.5L Ti-VCT a weep hole is provided on the front left side of the engine behind the generator. It is adjacent to a 13.5 mm (0.531 in) cup plug. The plug and the weep hole create a reservoir for normal coolant seepage and evaporation. Every coolant pump will have some leakage past the dynamic seal. Dampness and crusting around the weep hole is acceptable and an expected result of normal engine operation. Coolant spray or leakage amounts great enough to puddle should be addressed.