Anybody done one on a Subaru. Debbie's L will likely need one after finding the leak. 
AC compressor won't kick on no matter what buttons you press, but clutch kicks in and compressor turns fine if you hot-wire it. 
I am assuming there is a low pressure switch and thus that there is a leak and the system is empty.
Read 
This Link on Nasioc, but would like to talk to someone who has done one. 
Dad has a vacuum pump and gauges I can borrow. Not sure how you find a leak in an uncharged/vacuum system. Dye isn't going to help. Seems silly to charge a system to find a leak.
Heard Walmart has "kits"... not sure what is in them... Assume it needs a drier, oil and R134A.
Personally, I think Rachel should just rough it... 

  This is going to be her college car.