Had Mark from http://www.ac4cars.co.uk/ come to take a look.
Great guy and knows his stuff.
Vibration seems to be coming from expansion valve \ evaporator area.
May be vibration due to not enough gas. Also my condenser fan does not spin, big radiator fan is ok.
Going to get the fan replaced...
Car is an Audi A3 8p1 2005
Am trying to find the source of this humming noise.
Humming can also be felt as a vibration on the dash ans steering wheel.
Kinda sounds like the noise water running through old pipes make in a house.
Happens when the Air Con has been running for a while.
Goes away...
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