My A/C compressor has made a terrible noise when I first turn it on. Either sounds like a box of rocks or just a terrible clunk. Once it has run awhile there is no noise upon engagment. This only happens when it is cool, once warmed up there is no noise. This noise is only on the engagment of the A/C compressor. The A/C works just fine, just the occasional noise that worries me.
Bill
Bill