So last summer I had the hot on one side cold on the other when A/C was on, so I changed the DCCV this February. I Haden't had an opportunity to test the A/C because when I changed it, it was cold outside. Today I went to use the A/C and the air was luke warm not heated. Put the car in the air and after a few hours of testing things and inspecting others, I found that the compressor is not coming on and I found a hose with a peanut fitting on the end that was disconnected (the nut on the end somehow fell off) I traced the hose back to the drier. I'm assuming this is why I have no A/C now, so now I'm wondering can I just reconnect the hose and all will be well, and would that hose being disconnected cause the compressor not to turn on due to lack of pressure? Also can I just put any nut back in place of the missing one to connect the hose back? I included a picture of the hose and connection in question. Any help would be appreciated.