The Air Conditioning in my 1998 Dodge Avenger ES 2.5 does not work. Normally, I wouldn't care, but I installed an aftermarket Alpine stereo setup and without A/C, the amp in my trunk overheats very frequently. I can hear a squeaking while driving with the A/C button engaged that sounds like the compressor, but I can't tell if it's working or not and have no idea whether it's an electrical/wiring problem, a bad compressor or if it just needs a Freon charge. I would appreciate any help I can get, thanks!