pierre

i'm getting a vibration that comes from my engine, or something attached to it, that i can feel in my steering wheel and hear it. I only feel it and hear it when i'm stopped. Once i give it gas it disappears. If I touch the engine the vibration isn't as bad as if i touch the compressor or the water pump or power steering pump. It kind of feels like an unbalanced disc spinning.
If i turn the vent to anything that would use the compressor the vibration goes away.
the ac system is probably out of gas or very low. could a bad bearing or lack of lubrication be causing this?