I searched the threads for an answer to my issue but really couldn't find anything like my problem...Have an 83 300CD and there seems to be no regulation of temperature in the cabin...Heat seems to work but only if the temperature control is clicked into the full on position...Could this be the temperature sensor in the dash or is the control unit subject to the same bad solder joints that the cruise control is (recently resoldered and works now)subject to. I haven't even started looking at air conditioning but it seems to work the same way in that cooling only is full on or nothing. Blower seems to work fine and the vents seem to work OK and it will change from floor to defrost etc...Thanks to all who contribute to this forum as I have solved many problems just by reading and applying what I have learned...

__________________
83 300CDTurbo 307,000
2005 Honda Element 266,000
56 Nash Ambassador Country Club Special 34,000(under restoration presently)

http://www.peachparts.com/shopforum/showthread.php?t=125099