AC problem

[tavo80816]

2002 X5 4.4

AC blows cold air HOWEVER sometimes the air doesn't come out fast even if the speed is all the way to the max. It blows cold air as if I had the setting at one bar. Happens intermittently so there is no pattern to it. My wife is the main driver of the X5 so its hard for me to diagnose it since every time I drive it, it does not malfunction. BTW, the cabin filters under the hood have been replaced recently.

I have a 2001 740 E38 that had this problem years ago and after replacing the cabin filters under the hood and the ones under the center console, it never happened again. The X5 doesn't have filters under the center console, right?

[Scott ZHP]

Blower motor with a mind of its own is often times a failing blower motor resistor/final stage unit. A search should turn up dozens of threads.

The cabin microfilter is in a slot, near the firewall, under the hood.

[Zulu95]

Does your fan speed vary? Is it the volume of air not changing despite the fan speed varying?
I had the situation where, due to low refrigerant, the evaporator coil was icing up blocking the air flow despite the fan running on high speed. When everything was turned off for 10-15 minutes the icing disappeared and everything would be fine until it iced up again. An AC shop checked the system for leaks, evacuated and refilled the system.
If it is simply the fan speed not varying then change the FSR (Final Stage Resistor) as it is usually the most common failure point.