If I recall the pressure is of the high side. It should be 300psi or so when running and hot out. The value on the push button unit will be in bar, so one would divide by 14.2. Three bar would only be 45 psi, but if it isn't on (economy) and its cold out at all, 45psi could be OK.

What do you get on position #5 evaporator temp sensor. In the morning after everything has sat the first few actual values are temp sensors including 5 and they all should be the same temp if tested before the car runs.

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