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Can anyone tell me if my ac heater unit is bad? No matter what button I push or speed i switch it to it is constant air from the middle two vents. If I close t
them off I will get air from the other vents but still cannot change speed of temp. Any ideas?
 

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center vents are fresh air only, push button on the far left is max defrost, fan will run on high independent of switch position.

vacuum is used to open and close valves

there is a good troubleshooting guide here somewhere, search for "troubleshooting mercedes benz 190 e/d tempmatic climate control system"

good luck, I've been through most of this with mine, works great now
 

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the center vent is fresh air as stated and its always outside air to keep the driver awake.
 
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