When I turn on my A/C I hear a squeaky noise when I turn off the A/C the noise stops what could be wrong

When I turn on the AC, I hear a hissing sound, but there is no cold air.

The right windshield wiper nozzle (when sitting in the driver seat and looking forward) started to lose pressure. After 3-4 months of that, both nozzles lost pressure when trying to activate. The rear nozzle still works. When i pull lever to release liquid through front wiper fluid nozzles, it makes a noise but nothing comes out

4wd not engaging and makes a heavy sound whenever you drive on dirt surfaces