Been putting some miles on the X5, it's been smelling of coolant a bit every now and then so decided to clean the engine bay and look for leaks... nada again.

then I noticed two connectors on the air intake tube were loose

http://ills.bmwfans.info/m32.png



the connector of hose nr 6 got damaged, I taped that up for now and will have it replced later. However, under that connector is another hose spigot. The hose was disintegrated so the tube leading up to it was disconnected from the intake. I had an appropriate sized hose to I fixed the connexion. However, I can't find that hose on any of the parts diagrams... anyone know where it goes?

I mainly ask this because the car is making too much fan noise when warm if you ask me. Whether this is the secondary air pump or something else I can't seem to find out. I figured if the valve was leaking the airpump would be hot but it's not.