The vacuum that runs off an air compressor is not suitable for this job.

You need to check for leaks before you put refrigerant into the system.
The best way is to borrow or rent a Nitrogen bottle and get four ounces of R22...
You will need some way to detect that R22 as it leaks out..then you will need to fix those leaks...
Can you check with the PO and see if you can get more information ?
Have you checked the fuses for the fan inside the car ?
Are all your knobs turned towards COLD , Max AC, etc ?