I have a squealing sound that comes on ONLY with the AC on or with the Defrost on. Of course this sound started after I got my truck back from wrecking it. The body shop guy said that it was the part that rotates the fan or something like that. I can't really remember. Anyway, why didn't they fix that also?...cause it is considered one of those "wear" parts and there was no way of proving that it wasn't squealing before the accident. So my question is.... IS it the compressor? Is this a part that a mechanically inclined person can fix theirselves?

 

from the sound ur talken about it seems like its seized.. have a friend look at the ac compressor and turn on the a/c and when it engages if the middle part of the pulley doesnt move and the belt its squealing then u got urself a a/c pump problem.