Have a '94 Mazda B3000 p/u. When we first start it, we get a squeal then it goes right away, however when I turn the a/c on it squeals like crazy. A/C is instantly cold and the compressor was replaced with a new one (not re-manufactured) last summer. Would this be the a/c clutch needing replaced possibly? Month ago we had to replace the idle pulley between the alternator and a/c so that shouldn't be the issue. Thanks for your help!