Duovalve causing me hot air??
 

Finally got AC back to my 95, however, the climate control is giving me problem. If I just turn on the A/C (coldest setting) as normal, I will get warm hot in the 2 center vent and hot on the 2 side vents. If I press the blue button in the center, I will get cold air (~45F) in the center vent, but still hot on the outside vents.

This is forcing me to shut off the outside vents and only uses the 2 center vents for cooling.

The evaporator temp (code 5)from the climinate control is showing 42F, so I know the system is not low on freon.

Is this a classic duovalve stuck open symptons?

Also my driver side temp wheel is all over the place. I move the wheel a slight amount and the temp can jump 10F, it is very hard to control temperature on the driver side. Is this common?

Anbody can shed a word of wisdom on this?

Pinch off the hose going from the duovalve to the engine and check again.

I think the a/c is one of the weak points on W124s. It works but the whole system just seems overengineered to me. Plus I know very few W124s that haven't had the evaporator replaced by now. On my wagon the up/down air flow button requires the side vents to be closed half for max a/c performance (per the manual). With the down only button pushed, I have found that I can open the side vents a little and some cold comes out.. I replaced the duovalve as well (but for other symptoms)