where is air control damper in 2002 X5

My 2002 X5 a/c has recently begun blowing warmer out of the passenger
front and rear than it does from the driver vents. I recently replaced
the final stage resistor which fixed the flakey blower operation. I
can see the motors for the various dampers that direct air to the
floor, windshield, and front vents but do not see where the warm/cold
damper is located. The air from the driver side is 20 degrees or more
colder than the other vents. Do you have any experience with this or
know where to find service info on this area.

Same thing happened to my (1998, so perhaps more understandable) 535i.
Unfortunately in my case it is the microprocessor that's gone wonky,
and decides that it's really cold outside when it's 30C (95F) in the
shade.

Cost to fix ~£600 (mostly parts!). Plus the final stage resistor that
was actually working fine, and for which they charged me £150.

Good luck.