Hello! I installed a new monovalve in my 91 560 SEC due to lack of heat, and now all I have is heat. I checked the DC voltage at the monovalve connection, and it remains at around 13.4V no matter when the temp wheel is turned. Does this mean my climate control unit is shot? All of the buttons do what they are supposed to do, but blow strictly hot air... The AC was working, not sure if hot air is now getting into that flow, too... also, no instrument cluster or console illumination. I have the potentiometer out and am ready to replace it, but could there be some other problem? All fuses under the hood are good -- but is there another fuse that controls those lights hidden somewhere inside the car? Perhaps a control module of some kind? Is there a way to meter the three pins on the back of the instrument cluster that the potentiometer fit on? Can I test the potentiometer outside of the car? I apologize for all the questions, but that about covers it.
Thanks in advance, Bill Hard in NJ.