Hi, pretty strange problem
I think your engine mounts are gone. And take a visual check at the belts, pulleys at the A/C compressor. Visually check the auxiliary fan too with the A/C on if that makes any extra vibration.
You might have a bad A/C compressor. I would recommend to disconnect the connector of the compressor and switch on the A/C to see if there is any other electrical gremlin left.
"Temperature is on 16 Degrees.."
Do you mean here that the A/C blows cold air?