I have a UK spec 1991 525i M50. It doesn't have air-con and is a stick shift.

Next to the heater matrix inlet there is also a 4th smaller looking pipe with a rubber end that is hanging in the engine compartment. As this is a second hand car I don't know how long it has been like that and not sure if it is supposed to be connected as cannot find any reference to this in the Bentley or Haynes manuals.

Please can someone tell me what this is supposed to be connected to something or if it is just a breather pipe for something.

Thanks
Ian (A long time lurker on this forum that decided to register eventually ;-) )