Cruise control is not vacuum operated.

Check the fuses for the cruise control, also if your 3rd brake like bulb is burned out, the CC wil not work at all. If those both are fine, then you need to test for power and ground and you may even need to buy a new CC module, or get a junk yard one.

AC problem could be many thing, bad compressor, low on freon, too much freon, no power to compressor, leak in the system etc etc.

Maybe telling us what it is doing can help.