Hi there. This rough at idle concern doesn’t sound like something we want you to experience with your Bronco. Could you please send us a PM with your VIN and the name and location of your Ford dealer? I'd be happy to look into how I can assist you on my end.I posted about this exact thing today, I searched "vibration when AC is on" but your post didn't come up. Mine just started doing this yesterday. Our temps have been high the last few weeks. This week they are lower and this is the first time I noticed it. It's so rough that I can feel my seat and what feels like the whole undercarriage vibrating. I don't think it's normal.
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