Those are exact readings the the A/C system are receiving fron each sensor!!
#1 is in-car temp
#2 is the outside temp
#3 is the left heater core temp
#4 is the rt heater core temp
#5 is the a/c evaporator temp
#6 is the engine coolant temp
#7 is the a/c ststem pressure (this is your problem)!! must be at least 3 for the system to turn on!!
#8 is the refrigerant temp

Most of the other readings don't have affect on the a/c compressor operation!

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator