Strange Vibration

Micky, If these two pipes are tapped in to the two refrigerant pipes that run to the compressor then these are the service ports for the air con system, they should each have a black plastic cap on them.

If you know that your a/c system is low on refrigerant then get it looked at! The lubricant  for the compressor is carried by the refrigerant, the less refrigerant then it follows that there will not be the required amount of lubricant passing through the compressor, causing it to wear rapidly and become quite vocal, I have even known them to sieze up.

Whilst your looking at the a/c system do make sure that the electric cooling fan works, (This is a major weakness on all BMWs) it is designed to run when the refrigerant pressure exceeds 250psi (I think) The idea of this is that the fan should run when the car is in heavy/ stationary traffic and should cut out when on the open road and there is sufficient airflow over the condenser.

Right to update u guys on this problem.The cars been in the aircon is in a1 condition.The diagnoses to the problem was a restriction in the ventilation system which was killing the motors and not letting any air through,the pollen filter being the prime suspect.

Apparently on the E34 the are 6 places which this could be and sods law its the last one the mechanic tried.On removing the old one it was discovered that there were potatoes growing in it, i.e. it was well and truly rotten.Now the filters been exchanged all is as it should be nice cold air,in fact any air, at a stronger rate than an asthmatic hedgehog trying to blow a candle out :)  

I have another question which I hope one of u lot could answer, the car is 9 years old and by the sounds of things the pollen filter hasn't been changed at any of its service,most of them by Sytner.Now I would have thought that this item should be changed at 1 of the inspection services.Am I right?