2001 blazer leaking coolant above starter?

could be leaking from a head gasket and trickling down or your heater core is leaking and driping out of the condensation drain from inside the cab. most likely its your heater core. check the fire wall above the starter and look for that drain line. if it is dripping and is colored (green or orange) its coolant and coming from heater core. that's a bear to replace. good luck.