2000 CLK 430 Blower motor stays on even with car on. it seems to be stuck on high no matter what settings i have it on. please help.

 

have 2001 clk 430.. i had same problem,, dealer found that outside drain was clogged and caused water to run in a way that caused some kind of short, thankfully under warrenty....not sure if you have same drainage prob but sounds like you have some kind of a/c short....to help keep my battery from going dead which yours eventually will, i found fuse for a/c and pulled it so that it would shut off...good luck