The rear passenger vent that is in between the front two seats is only blowing cold air. Could this be a fuse issue? Any suggestions?

 

i thought only cold air goes out from there?

newer S-class got hot air.

 

Even when I have the heat all the way up, only cold air comes out from the rear vent.

The only adjustment I found was direction and the speed.

There is constant cool air and a few rear passengers have mentioned that. There are also vents under the seats that work.

 

the one on the flooring concealed by carpet (if you got one) got warm air on it, but the air vent on the center console doesn't give warm air.