I would suggest refering to the CD from Robert Bentley:
http://www.bentleypublishers.com/product.htm?code=EA90

If you are interested I could sell you one for $78 plus shipping.

There are self-diagnostics accessable thru the A/C control head (I think).

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician