So, last summer my wife's '02 WRX Wagon started making squealing sounds with the A/C on and the compressor pulley would lock up. I did some research on this forum and decided that the expansion valve was probably bad. I got a new one and replaced it with a lot of help from posts on this board and it worked great all summer. I was a big hero.
Now, she tells me it's doing the same thing again. Squealing and binding and dragging the motor down when it does it. She said the A/C is also not very cold anymore. I am down in Charlotte for awhile on business and she's back in Boston so I can't diagnose it myself other than asking her what it's doing.
Is it possible the expansion valve is stuck again or is it probably something else? I don't want to get involved with changing the expansion valve again if it's a bad compressor clutch or belt or something but it sounds exactly like it was before I changed the valve.
Any advice would be greatly appreciated.