Re: A/C and cruise control issue...
If the pressure in the AC lines is too low, most probably the compressor will not even be switched on. Do a full AC servicing at a specialist shop and you probably will be good again. It can be that there is a leak somewhere and that the gas charge just disappeared, but the shop will do a vacuum check and know if the system is tight before even putting the new charge in.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks /
Pirelli Scorpion ATR 245/65/17/
Transgo reprogramming shiftkit.