hey guys my dad is driving the z71 to work tommorow and he recently purchased a new compresser and i helped him get everythingm off and it fit well, its basically the same one, but the stock one has a plug in on the top that has 2 little needles that plug in and it the new one doesnt have it and when we went to plug it all up there was no plug in for the compresser and so we left the plug hanging and when we went to turn it on the compresser clutch didnt spin and the ac didnt blow out cold does anyone know if that plug is mandatory or what it does?! PLEASE HElp