The most likely reason the compressor is not coming on is because you are low on freon. The low pressure switch will keep the compressor from cycling on because damage to your compressor would result. You can jumper across the low presure switch with the engine running and A/C turned on, ( for short time only) this will provide you with question is my compressor clutch good, or am I just low on freon. The AC compressor relay switch may need to be replaced
most likely it is out of freon
Turn the compressor off.
For residential equipment it is 24 volts
Check the Freon pressure first. The AC compressor will not turn on if the Freon pressure is too low.
The ac compressorThe ac compressor
the ac belt or the compressor bearings are going bad
the clutch on your A/C compressor needs to be replaced.
IT should turn freely when the a/c is not turned on.
If it has AC assist and the compressor is shot, cut the belt or disconnect the defrost from the compressor.
90 percent is the compressor relay that cause it.
Chances are, your AC compressor pump is starting to tie up.
That depends on what you're trying to do. If you just want to make certain it doesn't turn on, unplug the clutch wire at the front of the compressor.