Why does my car knock when I turn the air on?
Why does my car knock when I turn the air on? Knocking or clicking usually signals loose mounting bolts or any of the other various air conditioning components not being tight enough. The loose parts will rattle and shake and you'll hear a racket when you kick on the AC. To troubleshoot this issue, turn your engine on, pop open the hood, and crank up the AC. Why does my car make a loud noise when I Turn on the AC? Loud squealing or screeching is the most common noise drivers experience when they turn on a malfunctioning AC. This...