1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
The recent thread on climate control codes got me to check mine. I don't ever recall doing it in the winter. #1 and #2, inside and outside temps are correct. #3 and #4 come in at about 100° and #5 comes in at about 40°. I think I need a little refrigerant because my AC is a little weak. My heater seems to be working reasonably well. So my question is, are the readings I'm getting appropriate for winter driving, i.e. outside temps in the mid-30's and the automatic climate control set to 70°?