A/C Leak

Chances are all the freon is gone anyway, so you won't have to evacuate. I swapped the compressor, dryer, and hoses a while back when the compressor seized. You will need the A/C disconnect tools to replace the lines. I ended up getting the replacement lines at Napa, but I'm sure other places carry them as well. The nice thing is it all comes in one assembly.

Here is a link to the Napa part.
Hose Assembly

The valve or the hose is replaceable.

Valve: http://www.mustang-tech.org/wiki/94-95_Mustangs_Cooling_Air_Conditioning

The hoses are around $40 locally.

Also look at changing out the dryer if the system has been discharged very long.

Wes

Wes

Like others have said above you will need a special tool to diconnect the ac lines. The entire ac line assembly does not need to be replaced, an ac shop can put new rubber hoses on the hardlines (this is what i did, its cheaper ). Before you put it all back togeather replace all of the o-rings and any time the system has been opened up the reciever drier needs to be replaced. Once back togeather, you need to get gauge set and a vacuum pump (some auto parts stores rent them out). Pull the system down to a vacuum to clean out all moisture or particles and see if it will maintain the vacuum. If it does hold vacuum you are leak free . Feed the system as many cans as it will take of freon with some good additives like stop leak and dye and you are done.