Hi,
The vibration from the A/C could be a couple things. A weak motor mount or the engine's idle speed is too low. Do you feel it when you are only at idle and in gear?
As far as the vibration at 60+ have you checked the condition of the tires and have the balance checked?
Here is a link that explains what to look for when checking tires for unusual wear:
https://www.2carpros.com/articles/how-car-tires-work
Let me know. Also, let me know if the A/C issue is only happens at idle and if the RPM's drop lower.
Take care and I'll watch for your reply.
Joe
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Thursday, June 25th, 2020 AT 7:40 PM