I heard that the compressor is always on unless the climate control is turned off or the EC button is turned on. This applies (compressor on) even when you are heating the cabin.

Charles, what does PBU stand for? I use the N22 read out for information like that also.

I am guessing item number 7 is the pressure in bar, correct? I don't have the list off hand, it's in my visor in my car. Now, can we tell if there is a leak or not by monitoring the pressure? What seems to be the "normal" pressure range and what pressure should we be concerned with? Anyone know? Hopefully Steve B will come and help us out.

And Benzfan, I agree with John S. on trying to put the blame on one of the AC shops.... though I'm assuming that would be rather difficult, but it's definitly worth a try and some persistence (for the $2100!)!

__________________
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!)