Thanks yes I had a similar thought. I am not sure what a typical system uses for inputs. There seems to be a pressure switch somewhere in the loop usually. I think the cars typically monitor many parameters so getting the factory ecu to do the job will involve some programming.
Probably simpler to fab a custom bracket for the old compressor, frankly, though getting the factory version to work or finding a clutched version of the compressor with similar mount would also really slick. I will see if I can get ahold of anyone at denson or get on some geeky ac forums. On Thu, Sep 17, 2020, 7:26 PM Max Dillon via Mercedes <mercedes@okiebenz.com> wrote: > So you need a signal generator that varies the signal to call for more or > less cold from the compressor? Sounds like a raspberry pi project, with a > simple dial and maybe a display to show the signal (I'd make the display go > from 1 to 11). > > Sep 17, 2020 9:43:30 PM Karl Wittnebel via Mercedes <mercedes@okiebenz.com > >: > > > Not to get too far into this but I have an om648 transplanted into a w123 > > wagon. The AC compressor is variable displacement fed by a pwm signal. It > > is not hooked up for this reason. > > > > Can anyone think of a way to interface that compressor to a regular > > thermostat? No clutch involved. > > > > An alternative would be to find a clutched compressor with the identical > > mount and form factor. > > > > Someone must make an aftermarket control solution for this type of > > compressor, though. Maybe I can figure out what the ecu uses for input > > signals and pirate some factory sensors from a 2006 w211 or whatever the > > original chassis was to mount in the 123 and drive the factory ecu > through > > the oem wiring harness to the compressor. > > > > Thanks > > > Max Dillon > Charleston SC > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
