818collection

I have a Mercedes Benz E320 wagon that has an AC issue going back a few years. At first it would take 15 to 20 minutes for cool air to start coming out of the center vents. Every time I restarted the car it went through this process. At some point, it quit blowing out of the center vents entirely, and there was no more AC.
About a year ago I replaced my battery. Upon doing this the AC worked great again. The AC worked fine for a couple months and then quit blowing out of the center vents again.
If I leave climate control set to blow out the center vents it will blow when I first start the car, as soon as the car starts driving the air switches to blowing out of the defrost vent. I have noticed recently that I can get full on heat from vent while set to low temp. The problem appears to be getting worse.
I have had a couple mechanics take a look at it. One replaced the expansion valve and recharged compressor which didn’t fix anything. I have a feeling it is a simple fix that very good Mercedes mechanics know about, but I have been unable to get this addressed.
I appreciate any knowledge or suggestions that any of you have 🙏

H danielle

hello , I think the problem here is the vaccum hoses which control the direction of air ..check it and there is a avaccum hose in the air mainfold under the hood check it because its control the direction of front air vent ...I try to give you some pictures ..

Plutoe

Nope not that hose as all flaps are under dash----go to the stickie and look for the W210 flap test do the test and you will then know what flap or flaps are the problem
And changing the faulty actuators is a big deal with dash removal