If there is a small visible hole like the one in the picture attached, it is called a weep hole and it's purpose is to notify you that you need to replace your water pump.
Or, it could just be condensation from the A/C compressor. Check your coolant level and you will find out if it is your water pump thats on it's way out.
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Wednesday, January 30th, 2013 AT 1:49 AM