Where is the drain plug on my Cadillac DTS 2009 & how to unclog it ? Please help

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When I use my A/C IT Leaks very very bad on passenger side,why ? ,is my a/c drain line stopped up ? If u agree can u PLEASE TELL ME WHERE THE DRSIN PLUG IS ? & THE easiest WAY TO GET TO IT THANK YOU SO MUCH FOR UR TIME & EFFORT IN THIS MATTER !! :) TS