Coolant has little bit to do with the A/C, but what you need to do is check your freon pressure.
I would just go to Autozone or another auto parts store and buy a can of freon w/oil that has the pressure guage built into the hose. Follow the instructions to recharge the system.
As far as the windows, it may be a fuse, there is a small diagram on the door to the fuse panel, if you lost the panel door, buy a Haynes or Chilton's manual.
2008 Mustang GT Premium 5 speed, MGW short throw shifter, 3.55 gears, black-on-black, IUP, 18in polished aluminum wheels, FRPP GTA Axle Backs, JLT II CAI w/SCT X-Cal 2. 296HP & 311TQ
1997 Mustang 3.8L AODE, CAI, Dual Exhaust, UDPs, 17" GT wheels
"Some people live their entire lifetime and wonder if they ever made a difference to the world. Marines don't have that problem." -- Ronald Reagan