Hmmm...

I may be wrong with this, but I believe the blue AC port cap is a standard indicator that the system has been converted to 134a. My "other make" cars with original factory fill 134a systems have black caps. My converted cars have blue caps that were installed to alert technicians of the switch from R12 to 134a. There also should be a decal warning of the conversion.

Factory CD ROMs for the 107 are available here for $20 plus shipping.

http://www.classictechlit.mbusa.com/MB/

FWIW,

230/8