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:

28: 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.

60: 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:

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)