Identify AC component

[dboy]

Tahoe 2001.
AC is not working.
Checked: Fluid in system. 1 AC relay and 1 fuse in fusebox under hood is ok. Can force compressor to start by direct wire from battery. Ac connector on dashboard is on.
I am pretty sure the component in attached picture is dead.
Is this a pressure sensor?

I can not find its name and part number.
Can someone help?

 

[Sparksalot]

It’s a low refrigerant pressure sensor. I used to have an 03 Silverado. When the refrigerant was low, I could unplug the harness and use a paper clip to jumper it in order to get the compressor to start.

 

[OR VietVet]

More Information for GM GENUINE 1550156

www.rockauto.com

As @Sparksalot said, It is a low pressure cycling switch that when enough refrigerant leaks out, that switch will not allow the a/c clutch to cycle.