My 2000 530d se has developed a fault with the climate control fan. It
now fails to respond to the +/- control and comes on at full speed.
Irrespective of the temperature settings it maintains max speed. It
can be switched off with the +/- control.
This looks like a failure in the speed control device? Is there a
seperate unit controlling the speed, or is this an integral part of the
fan motor assembly?