Hi Guys- I am new at this forum, and I have just got myself a 2001 X5 4.4i. I have read about the electrical gremlins and decided that I would gamble. However, my climate control (A/C) is blowing cool on the left & warm on the right. Has any one had that problem?
sasi :)

did you find a solution for this i am going through the same problem these days in my 2001 bmw x5

My problem was a leaking evaporator. The system was low on freon, and for some unrealistic reason the right vents were warm and the left vents were fairly cold. However, even as a Volvo Techinican owning an X5 and an S80 T6 Volvo, (It is fairly difficult on Volvo's to remove the dash to replace the evaporator and that, we do all the time) I had very little intention to remove the dash on the X5 to replace the evaporator, so I decided to try a short cut. I evacuated the systen, recharged with 1.5 LBS of R134a(as per vechicle A/C label) plus an additive called TLC2121 (A/C stop leak) and the A/C began working better but not perfect. It actually drove me up a wall. BMW insisted that I had to replace the evaporator. I just had to prove them wrong. I added more R134a, The High sde was 350-375 PSI the low side 35 psi, the fan came on full speed, the A/C ice cold. This is almost a year, still great. Last month the fan went dead and the A/c of course became inefficent again. New fan, A/c is kicking once more. I just could not get that system to cool with the suggested factory charge of 1.55 LBS. 2 LBS did the trick for me. I previously used this same stuff on my 95 M3 and it lasted over 2 1/2 years. I sold the M3 with the A/C working.
Phillip

I had the same symptoms...turned out to be a leaking valve on the high side. It was an inexpensive part (~$20), but requires a complete system evac and recharge which ran the install labor up to ~$200. The reason it was not cooling on the passenger side of the vehicle is that the leak made the overall system low on R134a... so as the stuff cycles from the compressor through the rest of the system, it heats up again and loses efficiency before it makes it back to the compressor.