I recently replaced the thermostat on my 2015 C300. I am struggling with finding the switch over valve that this vacuum line supposed to connect to.
I went to the dealer and no one there had any information that they would offer, I'm hoping that you can help me.
What I found for part number 50 off Mercedes-Benz parts information. Says that it runs from the pressure transducer to the switchover valve.

 

If you can provide your VIN I might be able to look up part numbers for you, and potentially provide a schematic.

 

thank you for your offer. I have it figured out. The Mercedes parts dept. it Tacoma WA helped me. The line ends up to the air intake. On top… I couldn’t remember disconnecting the line. Then just got stuck in my old head it had to be under the manifold. I sure still like playing with cars, but this was embarrassing.