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W212 E350 Automatic AC Control Issue

Please refer to this video: https://www.youtube.com/watch?v=BPuw6GrWX9Y&ab_channel=1AAuto%3ARepairTips%26SecretsOnlyMechanicsKnow

You can jump to 6:34 to this issue directly.

My 2014 E350 has this issue. According to this video, it is a common issue for W212 E350. I am wondering if any of you have this issue? Has any one did DIY fix of this issue? Thanks.

2 answers1 reply

3 Comments

Kevin Zhang

Sep 17, 2020

Senior Leigh, thanks for your reply. The worst thing of this issue is unpredictable. When you are on road for a long trip, the valve may fail. After you come back, it works fine. I have a mechanic use MB star to diagnose it. It always works fine in shop, but it could happen on the road. It happened three times on the road in last two years. I think I need to have this fixed.

Senior Leigh | 老李

Sep 19, 2020

Replying to

Is there any code stored at OBD when the mechanic connect the MB star?

Senior Leigh | 老李

Sep 17, 2020

I just check my 2012 E350, the warm air blown out when I switch the temp to the HI. The only difference is I turn the AC off and set two zones temp to HI. If you have an MB Star, that's pretty easy to identify the issue of the part. Maybe a reactive process can solve the problem.