AC always on
 

2011 PRHT It seems the AC is always on as it blows frigid air when the temp dial is on full cold. When I turn on the AC, the light comes on but there is no (Clutch) engagement sound from the AC as is common in cars. I rarely use the AC but do not want it running full-time.
ANy suggestions on how to test if it is on when the light is off and how to fix if it is?