Could anyone suggest a reason why the auxiliary fan in my 2003 X5 keeps
running even after the engine and ignition are shut off? I presume it's the
auxiliary fan but don't know for sure. The fan noise is emanating from the
area where the cabin filter is installed under the hood near the firewall.
Is it supposed to run all the time?
Tonight the fan sounds as if it's running at a constant speed. On other
occasions (last night, for instance) it sounded as if the speed varied. This
observation is based on the pitch of the fan sound. It appears to keep
running for hours after the engine and ignition are shut off. The car has
been off about 3-4 hours tonight and the fan is still running.
There doesn't appear to be any way to get it to shut off. Last night I
started the engine, turned off all interior fans, then shut the engine off.
The fan noise continued for several minutes (variable pitch noted) then
stopped. I tried the same thing this evening with no luck.
A Peake Research scan tool reported no codes.
The vehicle is out of warranty, so any help would be appreciated.
Thanks in advance!