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How to tell if an AC compressor is working. Welcome to Mercie J Auto Care, where compassion and craftsmanship come together. I'm Rick Smith, master certified technician. So first of all, I’m going to cover two things on this. Question one is how do you know if it’s engaging and secondly, how do you know if it’s working?

We get a lot of questions about control arms and we're working on some today so I thought I’d address that. Welcome to Mercie J Auto care, where compassion and craftsmanship come together. I'm Rick Smith, master certified technician. Now this is a control arm and most of control arm failures are in the bushings. So you have rubber bushings on two places as shown in the video.