Quote:
Originally Posted by 300sdToronto
I have the same problem with my 83 300sd and have replaced the monovalve insert and the cabin temperature sensor with no result. In my case I get swings of very hot air with periodic blasts of hot air out of the dash vents and no hot air at any time out of the foot well vents.
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With the CCU funtioning properly, you can never get hot air out of the dash vents........no matter what the setting. So, with that tidbit, the CCU is definitely the culprit.
But, it may not be the only culprit. With no air out of the footwells, the problem could be the CCU, but is more likely to be a vacuum switchover valve , the vacuum pod, or the linkage from the pod to the footwells. Right now, the SD has no driver's footwell air.......but it does have passenger footwell air........go figure.......