Well... I have been "touching the surface" on this matter for some time, as I've had a leak in the system.
Recently however, I realized that I have no control over the air flow. All airflow is directed to default (defrost & outboard dash vents) at all times, regardless of manual air flow selection or AUTO, or selected in cabin temperature. I am able to hear a faint clicking from the dash when I attempt to divert the air to the dash vents or the floor, but no action... same with RECIRC. The "default" air passage (defrost & side vents) blows outside air... and the faster I'm driving (IE: fwy), the faster the air blows.
Also prior to the complete failure, if I had the A/C on, air would stop blowing through the dash vents when I accelerated, and then would properly start flowing back through the dash vents upon deceleration or coasting.
I have retrieved the climate control fault codes, and am consistently coming up with 28 and 60 only. I delete them every few days, and those are the only 2 that recur (intermittent, fortunately).
The 2 recurring codes are:
: Well I can't find the meaning of 28. I have been searching the archives with no luck; I don't understand? I just finished sifting through some 2500
posts of mine! I know the info is in the archives. Argh, oh well.
: A/C Compressor Electromagnetic Clutch (A9k1).
Cause: Short or Open Circuit. Intermittent (not continuous).
This doesn't seem to be vacuum related though...(see following link for more depth on this)
A/C Diagnostics Codes
Just for fun: