The blower final stage fan resistor is known to fail. Symptoms are the heater fan speed varies regardless of the setting, the fan will not turn off when the car is switched off, or the fan will not switch on at all.Google+
Car Problem Reports
BMW X5 Blower Final Stage Fan Resistor May Fail
BMW X5 Problem
Average Mileage: 100,595 mi (10,045 mi - 203,000 mi)
Visitor, 2003 BMW X5, 113,000 mi
ac or heat not blowing
Visitor, 2003 BMW X5, 134,000 mi
THE FAN DOES NOT COME ON WHEN PUTTING ON A/C. i DO HERE THE COMPRESSION SWITCH ON.
Visitor, 2003 BMW X5, 97,000 mi
Similar to as the description, all was fine then one day and after detailing the interior etc I cam across the fan running, afer i shut off the engine
Brought it to the dealer; fan relay switch ( $50 for the part, $65 for the labour)
all is well again
Thanks for a great website
Visitor, 2002 BMW X5, 54,000 mi
I bought this car at 54,000 miles and the max button on the heater does not work and has not since I bought the car. Now the entire heating system seems to be acting strangely with the blower only working occassionally.
Visitor, 2002 BMW X5, 156,000 mi
after I leave my car overnight and morning the battery low
Visitor, 2005 BMW X5, 106,750 mi
heater still blowing after engine switch off
Visitor, 2005 BMW X5, 106,000 mi
Blower motor and resistor stopped working. No air (heat or cold) blew through the vents. Took it to dealership, discovered it was the heater valve that caused the issue. Dealer stated this is a known issue with X5 trucks since the 2003 model. Cost for repairs: $1987.00 for replacing heater valve, blower motor and resister.
Visitor, 2002 BMW X5, 203,000 mi
the blower is not working at all. I can feel heat when i put my hand over the heating vent but does not blow. The rear and front defroster work but i do not hear any air blowing
Visitor, 2000 BMW X5, 87,950 mi
Replaced this failed part in January 2011 when the fan would not turn off. It seems to have just failed again in June 2014 but this time the fan won't turn on. It has stopped blowing briefly and then started working again 3 times in the last month but I think it's finished this time.
Visitor, 2001 BMW X5, 87,000 mi
Dealer charged $250 for parts and labor. I wished I had came across BMW forum and can take care of it myself and save money :-(