A/C compressor runs all the time, Clanking from Back

I find it strange that the A/c compressor seems to run all the time, even-though I pushed all the ac buttons to off. There is clanking from both sides in the rear. I removed the rear wheels and looked underneath all seems ok nothing broken, I oil every moving part in the rear suspension this did not help at all. Any ides ?????

 

try Was just told by my mechanic that my ac compressor clutch is stuck