i haveantifreeze leaking behind my a/c unit is there a freeze out plug located anywhere around there i have a99 blazer 4.3 vortec or what else can it be it is to high to be the water pump and all the hoses are good

 

I am afraid this sounds like a lower intake manifold leak, but other possibilities are the thermostat housing or a faulty upper radiator hose. The upper radiator hose wraps around behind the A/C compressor before continuing back up front to the radiator.

 

i found a hex plug in the block that is rusted out looks like the leak came from the intake man and was leaking for a while not to bad but bad enough and it ran down to this plug and the rest is history thanks for the feedback