It's a 1980 w116. It has AccII with an UnwiredTools servo replacement. The heater circuit has a ball valve to positively turn it off during the summer. I have the same expansion valve as shown above in post 3. Temperature was measured using my VOM meter with the temperature probe placed against the evap pipe.

Vent temps are around 47-50 degrees as measured with the doors closed and the system on recirculate.